Computerworld 1996 April

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OS/2 Help File | 1995-07-05 | 39.5 KB | 1,026 lines

ΓòÉΓòÉΓòÉ 1. Introduction ΓòÉΓòÉΓòÉ PMJPEG is a shareware image viewer with image processing and conversion capabilities for OS/2 2.x. PMJPEG is a port of WinJPEG to OS/2 2.x. It is a native 32-bit PM application. PMJPEG v.1.7 has the following features: Γûá display JPEG, TIFF, IFF, GIF, Targa, PCX, Windows BMP, OS/2 BMP, or PPM images Γûá export an image to JPEG, TIFF, IFF, GIF, Targa, PCX, Windows BMP, OS/2 BMP, or PPM format Γûá capability of generating OS/2 desktop-background bitmaps that use the system colors Γûá display an image in monochrome, 16 color, 256 color, hicolor, or truecolor display modes Γûá display an image in full screen mode Γûá zoom with fixed or user-selected scales Γûá print an image with scaling, best proportional fit on the page, or fit for full page Γûá red/green/blue or hue/saturation/brightness adjustment Γûá color to grayscale conversion or image negative conversion Γûá contrast enhancement Γûá gamma correction Γûá image rotation, vertical or horizontal flip, and image resizing Γûá image cropping Γûá batch file compression of GIF, TIFF, Targa, or PPM files to JPEG File Interchange Format Γûá copy an image to the clipboard or paste an image from the clipboard Γûá slideshow: display selected files in forward, reverse, or random order with a cycle option Γûá image buffering in a cyclic slideshow Γûá capture a window, the client area of a window, or a portion of or the entire desktop Γûá support for file name extension association and starting a slideshow from the command line Γûá automatic icon generation for WPS file objects ΓòÉΓòÉΓòÉ 2. Known Problems ΓòÉΓòÉΓòÉ There are two bugs in the 256 color ET4000 driver that comes with the OS/2 2.1 beta or OS/2 2.0 + Service Pack: 1) the driver does not stretch the bitmap correctly so the Stretch Image to Fit Window option does not work properly, and 2) the image under the dialog box or under the drop-down menu is not re-drawn with the right colors. Use the Auto-Refresh option if you have the second problem. If you are using the 256 color ET4000 driver, for certain images such as 24-bit images displayed with Maximum Color Depth set to 256 colors, the text that shows the cropping dimensions is garbled by a filled box. This appears to be a bug in OS/2's palette manager or the driver. If you are using a 256 color driver, when you exit PMJPEG, the system colors do not immediately return to normal. The system colors are gradually restored by OS/2. You can force the colors to change back by opening and/or closing a window, such as the window list that pops up when you hit CTL-ESC. ΓòÉΓòÉΓòÉ 3. JPEG ΓòÉΓòÉΓòÉ Joint Photographic Experts Group (JPEG) refers to a still-picture compression standard that specifies several modes of operation. The mode used by the Independent JPEG Group's(IJPEG) software, which is incorporated into PMJPEG, is sequential buildup; in this mode, each component of an image is encoded in a left-to-right and top-to-bottom scan. Sequential mode is lossy, which means that when you compress an image, you will lose information. That is, when you decode the compressed image, the decoded image will not exactly match the original. One reason that sequential mode JPEG is lossy is that the algorithm compresses an image by removing visually insignificant information, colors that the human eye cannot detect. ΓòÉΓòÉΓòÉ 4. Converting File Formats with PMJPEG ΓòÉΓòÉΓòÉ Images can be converted from one file format to another by loading an image with the File Open menu item and saving it to the desired file format with the File Save menu item. Before you load an image that you want to convert, you should check the Maximum Color Depth option. This option determines the maximum number of colors in a displayed image. Even though an image may look good, there may have been a loss of colors and data in the image. For example, suppose you are viewing a 24-bit image with Maximum Color Depth set to 256 colors. The 24-bit image can have up to 16.7 million colors but the number of colors in the image is reduced to 256 when it is loaded. When you save this image to a different format, you lose many colors that were in the original image. To avoid losing colors in the image, you should set Maximum Color Depth to 16.7 million colors before loading the image. Batch Compression of images to JPEG is not affected by the Maximum Color Depth option. If you are creating a bitmap to be used as an OS/2 desktop-background image, apply the Map to System Colors function to a displayed image before saving it to an OS/2 BMP file. If you are converting a 24-bit image to an OS/2 BMP, you should set Maximum Color Depth to 16.7 million colors before you load the image. This produces a better looking background image than one created by loading a 24-bit image with a Maximum Color Depth of 256 colors and then applying the Map to System Colors function. ΓòÉΓòÉΓòÉ 5. Starting a Slideshow from the Command Line ΓòÉΓòÉΓòÉ A slideshow can be initiated from the OS/2 command line by executing the following at the OS/2 prompt: pmjpeg [filename 1] [filename 2] [filename 3] ... [filename n] The files are displayed in the order in which they are entered on the command line. Also, the slideshow options that were saved by the Save All Options menu item are used. If no options were saved, the default slideshow options are used. There is no limit to the number of files that you enter. The only restrictions are the number of characters that you can fit in one command at the OS/2 prompt. For example, if you wanted to display the files, "colrtest.jpg", "mirri3.jpg", and "image1.gif", in the order listed , type pmjpeg colrtest.jpg mirri3.jpg image1.gif This example assumes that PMJPEG is in your search path and this command is executed in the directory containing the images. If OS/2 can't find "pmjpeg.exe" or the images, you can prefix "pmjpeg.exe" or the images with a standard OS/2 path. Also, you can have wildcards in the filenames. For example, typing pmjpeg *.jpg sample?.gif will display all the files with the ".jpg" extension and all "sample?.gif" files in the current path. ΓòÉΓòÉΓòÉ 6. Image File Formats ΓòÉΓòÉΓòÉ o BMP o Graphics Interchange Format (GIF) o Interchange Format File (IFF) o JPEG File Formats o PCX o Portable Pixmap (PPM) o Targa o Tagged Image File Format (TIFF) ΓòÉΓòÉΓòÉ 6.1. BMP ΓòÉΓòÉΓòÉ PMJPEG can view Windows and OS/2 (1.x and 2.0) BMP files stored with 1, 4, 8, or 24 bits per pixel and can view BMP files that are run-length encoded(RLE). In addition, it can display the first image in an OS/2 bitmap array. It can save uncompressed Windows or OS/2 BMP files in 1, 4, 8 or 24 bits per pixel and can save BMP files with RLE. Note that some graphics viewers use the file extension ".RLE" for run-length encoded Windows BMP files. PMJPEG uses the ".BMP" extension as a default for such files. ΓòÉΓòÉΓòÉ 6.2. Graphics Interchange Format (GIF) ΓòÉΓòÉΓòÉ PMJPEG can view interlaced/non-interlaced GIF87a and GIF89a files, and it can save non-interlaced GIF87a files. If a GIF89a file contains more than one image, it will display the first image in the file. ΓòÉΓòÉΓòÉ 6.3. Interchange Format File (IFF) ΓòÉΓòÉΓòÉ The IFF format is a standard for Commodore Amiga computers. PMJPEG can read/write uncompressed and run-encoded FORM InterLeaved BitMap (ILBM) files stored with 1, 2, 4, 8, or 24 bits per pixel. Hold And Modify (HAM) mode and Sliced HAM (SHAM) mode are also supported; HAM's can be loaded/saved and SHAM's can only be loaded. ΓòÉΓòÉΓòÉ 6.4. JPEG File Formats ΓòÉΓòÉΓòÉ The JPEG committee has not specified a standard file format, and consequently, many applications of the JPEG algorithm use their own proprietary format. PMJPEG uses the JPEG File Interchange Format(JFIF) which transports only pixel information. JFIF is supported by the IJPEG Group's software and other programs based on their code. Handmade Software's GIF2JPG and Image Alchemy use a proprietary JPEG format that is not compatible with the JFIF standard. This proprietary format is not supported by PMJPEG. When you use GIF2JPG v.2.0, remember to leave out the "-s" option to produce a JPEG file that is compatible with the JFIF standard and viewable with PMJPEG. ΓòÉΓòÉΓòÉ 6.5. PCX ΓòÉΓòÉΓòÉ PMJPEG can view PCX files stored with 1, 4, 8, or 24 bits per pixel. If a 1, 4, or 8 bits per pixel PCX file does not have a valid palette, PMJPEG will use a default palette. It can save PCX Version 3.0 files with 1, 4, 8 or 24 bits per pixel. ΓòÉΓòÉΓòÉ 6.6. Portable Pixmap (PPM) ΓòÉΓòÉΓòÉ PMJPEG can view Portable Pixmap(PPM) and Portable Graymap(PGM) files. It can save a subtype of the PPM format in which the pixel values are stored in binary. The color depth of this subtype is always 24 bits per pixel. ΓòÉΓòÉΓòÉ 6.7. Targa ΓòÉΓòÉΓòÉ PMJPEG can view uncompressed or run-length encoded Targa files stored with 8, 15, 16, 24, or 32 bits per pixel and it can save uncompressed Targa files with 8 or 24 bits per pixel. ΓòÉΓòÉΓòÉ 6.8. Tagged Image File Format (TIFF) ΓòÉΓòÉΓòÉ PMJPEG supports a subset of the TIFF 6.0 specification. PMJPEG can view TIFF files stored with 1, 4, 8, or 24 bits per pixel. PMJPEG can read TIFF images stored in strip format, in which the image is divided into horizontal strips of pixels, and tile format, in which an image is divided into rectangular grids of pixels. The compression modes LZW, Packbits, Thunderscan, NeXT, and CCITT (RLE, RLEW, FAX3, FAX4) can be read as well as uncompressed TIFF images. PMJPEG can save uncompressed or Packbits-(Macintosh RLE), LZW-(with or without differential encoding), CCITT Group 3-, or CCITT Group 4-compressed TIFF files with 1, 4, 8 or 24 bits per pixel. TIFF files are saved in strip format. ΓòÉΓòÉΓòÉ 7. Menu Commands ΓòÉΓòÉΓòÉ The menus are ordered by the following main topics: o File Menu o Edit Menu o View Menu o Capture o Options ΓòÉΓòÉΓòÉ 7.1. File Menu ΓòÉΓòÉΓòÉ The File menu includes commands that enable you to open and save files, to batch convert files to JPEG, and to display multiple images in a selected order. o Open o Save As o Save All Options o Delete o Batch Compression o Slideshow o Print o Print Setup o Print Options o 1, 2, 3, 4 o 5, 6, 7, 8 o Exit ΓòÉΓòÉΓòÉ 7.1.1. Open ΓòÉΓòÉΓòÉ Select the name of a file to display. The file formats that are supported are the JPEG File Interchange Format (JFIF), TIFF, GIF 87a/89a, IFF, Targa, PCX, PPM or Windows/OS/2 BMP. ΓòÉΓòÉΓòÉ 7.1.2. Save As ΓòÉΓòÉΓòÉ Select the name of the output file and the output format, which is the JPEG File Interchange Format(JFIF), TIFF, GIF 87a, IFF, uncompressed Targa, PCX, PPM, Windows BMP or OS/2 BMP. ΓòÉΓòÉΓòÉ 7.1.3. Save All Options ΓòÉΓòÉΓòÉ This will save all the PMJPEG options to a file named "pmjpeg.sav" in the same directory as the PMJPEG executable. When PMJPEG is initially loaded, the options will be loaded if "pmjpeg.sav" exists. ΓòÉΓòÉΓòÉ 7.1.4. Delete ΓòÉΓòÉΓòÉ This menu command lets you delete the file containing the currently displayed image. PMJPEG will prompt you for confirmation before deleting the file. ΓòÉΓòÉΓòÉ 7.1.5. Batch Compression ΓòÉΓòÉΓòÉ Select GIF, TIFF, PPM, and Targa files to compress to JPEG format with the options specified in the JPEG Options dialog. The list boxes in the left column display the drives and the directories in the current path, the list box in the middle displays the files in the current path, and the one in the right displays a list of files to be converted. To add file(s) to the "Files Selected" box, select the file(s) you want to convert and press the "Add" button. To remove file(s) from this box, select the file(s) in this box and press the "Remove" button. The output file(s) will have the same name as the input file(s) except that they will have a ".jpg" extension. Also, the output file(s) will be placed in the same directory path in which the input file(s) were located. See also JPEG Options. ΓòÉΓòÉΓòÉ 7.1.6. Slideshow ΓòÉΓòÉΓòÉ Select the JPEG, TIFF, GIF, IFF, Targa, PPM, and BMP files to display in a slideshow. The order in which you add the files will be the order in which they are displayed. After a picture is loaded and displayed, if Automatic Slide Advancement is selected, there will be a user-selected delay before the next picture is loaded. To advance to the next picture before the delay has elapsed, click on the window with the right mouse button. If Manual Slide Advancement is selected, PMJPEG will wait until you click with the right mouse button before advancing to the next picture. If you would like the slideshow to continue from the beginning of the list after the last picture is displayed, check off the Cycle Slideshow menu option. To abort the slideshow, click on the window with the left mouse button, click on the "Yes" button in the confirmation dialog, and the slideshow will stop after the currently loading picture is displayed. See also Slideshow Options. ΓòÉΓòÉΓòÉ 7.1.7. Print ΓòÉΓòÉΓòÉ Print the image currently displayed. ΓòÉΓòÉΓòÉ 7.1.8. Print Setup ΓòÉΓòÉΓòÉ The Print Setup dialog box lets you select the Printer and Job Properties. The Job Properties dialog box allows printer driver-dependent options to be changed. ΓòÉΓòÉΓòÉ 7.1.9. Print Options ΓòÉΓòÉΓòÉ The displayed image can be printed in three ways: 1) best fit for the page, 2) fit for the full page, or 3) scaled by a user-selected factor. Best Fit scales the image for maximum fit on a printed page while maintaining the image's aspect ratio. Fit for Full Page scales the image such that it fits the entire page. The Scale option scales the printed image's width or height by an integer factor that is selected by the user. ΓòÉΓòÉΓòÉ 7.1.10. Exit ΓòÉΓòÉΓòÉ Exit from PMJPEG. ΓòÉΓòÉΓòÉ 7.1.11. 1, 2, 3, 4 ΓòÉΓòÉΓòÉ The four most recently used file paths and their respective file types for viewing an image. If you select one of these menu items, the open dialog will be displayed with a list of files limited to the selected file type in the corresponding file path. ΓòÉΓòÉΓòÉ 7.1.12. 5, 6, 7, 8 ΓòÉΓòÉΓòÉ The four most recently opened images. Choosing one of these menu-items re-opens the selected file. ΓòÉΓòÉΓòÉ 7.2. Edit Menu ΓòÉΓòÉΓòÉ The Edit menu includes commands that enable you to transfer images to and from the clipboard, change the color components of an image, and to manipulate the image. o Copy o Paste o HSV Adjustment o Color Balance o Contrast Enhancement o Gamma Correction o Grayscale o Negative o Map To System Colors o Rotate o Flip Horizontal o Flip Vertical o Resize o Crop o Crop Stretched/Zoomed Image ΓòÉΓòÉΓòÉ 7.2.1. Copy ΓòÉΓòÉΓòÉ Copy the entire image to the clipboard. ΓòÉΓòÉΓòÉ 7.2.2. Paste ΓòÉΓòÉΓòÉ Paste an image from the clipboard. ΓòÉΓòÉΓòÉ 7.2.3. HSV Adjustment ΓòÉΓòÉΓòÉ Use the scroll bars to adjust the amount of hue, saturation, and value/brightness in an image. A value of 0 on the scroll bar means that there is no change in the corresponding color component. When the value is increased or decreased, the color component is increased or decreased, respectively. ΓòÉΓòÉΓòÉ 7.2.4. Color Balance ΓòÉΓòÉΓòÉ Use the scroll bars to adjust the amount of red, green, and blue in an image. A value of 0 on the scroll bar means that there is no change in the corresponding color component. When the value is increased or decreased, the color component is increased or decreased, respectively. ΓòÉΓòÉΓòÉ 7.2.5. Contrast Enhancement ΓòÉΓòÉΓòÉ Use the scroll bar to adjust the amount of contrast in an image. A value of 0 on the scroll bar means that there is no change in the contrast. When the value is increased or decreased, the contrast is increased or decreased, respectively. ΓòÉΓòÉΓòÉ 7.2.6. Gamma Correction ΓòÉΓòÉΓòÉ Use the scroll bar to adjust the amount of gamma. A value of 1.0 on the scroll bar means that there is no change in the image. In general, increasing the gamma makes the image lighter and decreasing it makes the image darker. A gamma of 2.2 is a commonly used value. ΓòÉΓòÉΓòÉ 7.2.7. Grayscale ΓòÉΓòÉΓòÉ Convert a color image into a grayscale one. ΓòÉΓòÉΓòÉ 7.2.8. Negative ΓòÉΓòÉΓòÉ Obtain the negative of the image. ΓòÉΓòÉΓòÉ 7.2.9. Map To System Colors ΓòÉΓòÉΓòÉ Converts the displayed image to an image that has a 256-color palette containing the system colors of the OS/2 desktop. Use this option to generate an image that can be used as a 256-color OS/2 desktop-background image. ΓòÉΓòÉΓòÉ 7.2.10. Rotate ΓòÉΓòÉΓòÉ Rotate the image clockwise by 90 degrees. ΓòÉΓòÉΓòÉ 7.2.11. Flip Horizontal ΓòÉΓòÉΓòÉ Flip the image around the vertical axis. ΓòÉΓòÉΓòÉ 7.2.12. Flip Vertical ΓòÉΓòÉΓòÉ Flip the image around the horizontal axis. ΓòÉΓòÉΓòÉ 7.2.13. Resize ΓòÉΓòÉΓòÉ Change the spatial resolution of the displayed image. Common sizes such as 640x680, 800x600, 1024x768, and 1280x1024 can be easily selected. The Maximize Fit on Desktop option will resize the image into the largest possible window that will fit on the desktop while keeping the aspect ratio, the ratio between the original width and height. Also, a custom size can be manually entered. If Keep Aspect Ratio is enabled, only one dimension needs to be entered because the other one is automatically changed to maintain the aspect ratio. ΓòÉΓòÉΓòÉ 7.2.14. Crop ΓòÉΓòÉΓòÉ If a region of the image is selected (see Selecting a Region to Crop or Zoom), keep that region and discard the image outside of the selected region. If the image is stretched or zoomed, the region corresponding to the pixels of the normal-sized image becomes the new image. ΓòÉΓòÉΓòÉ 7.2.15. Crop Stretched/Zoomed Image ΓòÉΓòÉΓòÉ If a region of the image is selected see Selecting a Region to Crop or Zoom), keep that region and discard the image outside of the selected region. ΓòÉΓòÉΓòÉ 7.3. View Menu ΓòÉΓòÉΓòÉ The View menu includes commands that let you view an image in full screen mode or with different scales without changing the image's data. o Stretch Image to Fit Window o Keep Aspect Ratio if Stretched o Full Screen o Zoom In o Zoom Out o Zoom In/Out Region o Exit Zoom Mode ΓòÉΓòÉΓòÉ 7.3.1. Stretch Image to Fit Window ΓòÉΓòÉΓòÉ When this option is checked, the scrollbars for the PMJPEG window are turned off and the image is stretched to the dimensions of the client area of the PMJPEG window. This option does not permanently change the resolution of the image. If you save the image, the original image is saved, not the stretched one. ΓòÉΓòÉΓòÉ 7.3.2. Keep Aspect Ratio if Stretched ΓòÉΓòÉΓòÉ When this option is checked along with Stretch Image to Fit Window, the image is stretched while maintaining the image's aspect ratio. ΓòÉΓòÉΓòÉ 7.3.3. Full Screen ΓòÉΓòÉΓòÉ View the currently displayed image with the full screen. If the image is larger than the entire screen, the image will be resized with the best proportional fit before it is displayed. If the image is smaller, it will be displayed in the center of the screen. To exit from full screen mode, press any key or click on the screen with the left mouse button. ΓòÉΓòÉΓòÉ 7.3.4. Zoom In ΓòÉΓòÉΓòÉ o Fixed Scale o Selected Scale ΓòÉΓòÉΓòÉ 7.3.4.1. Zoom In/Fixed Scale ΓòÉΓòÉΓòÉ View the currently displayed image enlarged by a factor specified by one of the fixed zoom ratios. ΓòÉΓòÉΓòÉ 7.3.4.2. Zoom In/Selected Scale ΓòÉΓòÉΓòÉ View the currently displayed image enlarged by a user-selected zoom ratio or by a user-selected percentage. ΓòÉΓòÉΓòÉ 7.3.5. Zoom Out ΓòÉΓòÉΓòÉ o Fixed Scale o Selected Scale ΓòÉΓòÉΓòÉ 7.3.5.1. Zoom Out/Fixed Scale ΓòÉΓòÉΓòÉ View the currently displayed image reduced by a factor specified by one of the fixed zoom ratios. ΓòÉΓòÉΓòÉ 7.3.5.2. Zoom Out/Selected Scale ΓòÉΓòÉΓòÉ View the currently displayed image reduced by a user-selected zoom ratio or by a user-selected percentage. ΓòÉΓòÉΓòÉ 7.3.6. Zoom In/Out Region ΓòÉΓòÉΓòÉ If a region of the image is selected (see Selecting a Region to Crop or Zoom), scale the image so that the region of interest is fully displayed in the PMJPEG window. ΓòÉΓòÉΓòÉ 7.3.7. Exit Zoom Mode ΓòÉΓòÉΓòÉ View the zoomed image at its normal size. ΓòÉΓòÉΓòÉ 7.4. Capture Menu ΓòÉΓòÉΓòÉ The Capture menu includes commands that let you capture the entire screen, a part of the screen, a window, or a part of a window. o Window o Client Area o Desktop o Area of Desktop o Hide Window ΓòÉΓòÉΓòÉ 7.4.1. Window ΓòÉΓòÉΓòÉ After selecting this menu item, the PMJPEG window hides itself and you must select a window to capture by moving the mouse pointer over the desired window and clicking on the window with the left mouse button. ΓòÉΓòÉΓòÉ 7.4.2. Client Area ΓòÉΓòÉΓòÉ After selecting this menu item, the PMJPEG window hides itself and you must select a client area of a window to capture by moving the mouse pointer over the desired window and clicking on the window with the left mouse button. The client area does not include the window frame or menu bar. ΓòÉΓòÉΓòÉ 7.4.3. Desktop ΓòÉΓòÉΓòÉ Capture the entire desktop. See also the Hide Window option. ΓòÉΓòÉΓòÉ 7.4.4. Area of Desktop ΓòÉΓòÉΓòÉ After selecting this menu item, you must select an area of the desktop to capture. To select a region of the desktop, click on the desktop with the left mouse button. While holding down that button, move your mouse until the rectangle surrounds the desired region, and then release the mouse button. The dimensions of the selected region are displayed in the center of the indicated region. See also the Hide Window option. ΓòÉΓòÉΓòÉ 7.4.5. Hide Window ΓòÉΓòÉΓòÉ When this option is checked, the PMJPEG window hides itself before capturing the desktop with the Desktop or Area of Desktop command. ΓòÉΓòÉΓòÉ 7.5. Options Menu ΓòÉΓòÉΓòÉ The Options menu includes commands that let you determine how other commands operate. The settings for the options can be saved with the Save All Options command. o Maximum Color Depth o Display Old Image during Load o Auto-Refresh o Generate Icons o Suppress Warnings o Window Options o JPEG Options o Slideshow Options o Priority Options o Preferences ΓòÉΓòÉΓòÉ 7.5.1. Maximum Color Depth ΓòÉΓòÉΓòÉ When you load an image that has more colors than the Maximum Color Depth setting, PMJPEG will reduce the number of colors to the Maximum Color Depth setting before displaying the image. If you are viewing images, you should set this option to the number of colors supported by your display driver. If you are converting images from one file format to another, you should set it to 16.7 million colors. ΓòÉΓòÉΓòÉ 7.5.2. Display Old Image during Load ΓòÉΓòÉΓòÉ If this option is checked, you can continue viewing the currently displayed image while another image is being loaded. However, this option will use more memory because PMJPEG has to maintain two images. Consequently, it may slow down the loading of the next image if PMJPEG runs out of physical memory and must use slower virtual memory. ΓòÉΓòÉΓòÉ 7.5.3. Auto-Refresh ΓòÉΓòÉΓòÉ The purpose of this option is to provide a temporary solution to a bug in the 256 color drivers. This bug is evident when the area of the image under a drop-down menu or under a dialog box is not properly redrawn after the drop-down menu or the dialog, respectively, is closed. If this menu item is checked, PMJPEG will automatically refresh the image when it is necessary. ΓòÉΓòÉΓòÉ 7.5.4. Generate Icons ΓòÉΓòÉΓòÉ When this option is checked, PMJPEG will automatically generate icons for OS/2's WorkPlace Shell whenever an image file is opened. These icons will be shown if you view the directory with the images using the Drives object on the desktop. On slower machines such as a 386, using a slideshow to generate icons for batches of files may not work for all files if the delay between images is set below 5 seconds. This is a bug in OS/2. To work around it, use a longer delay between slideshow images. Fast 486 machines do not have this problem. ΓòÉΓòÉΓòÉ 7.5.5. Suppress Warnings ΓòÉΓòÉΓòÉ If this option is checked, PMJPEG suppresses all warnings. Warnings occur when you load a corrupted image or discard an image that has changed. ΓòÉΓòÉΓòÉ 7.5.6. Window Options ΓòÉΓòÉΓòÉ The Window Z-Order options determine the relative level of the PMJPEG window to other windows on the desktop, immediately after an image is loaded. The level is not changed if Keep Current Order is set. If the Below All Windows option is set, the PMJPEG window will place itself under any window that overlaps it. If the Above All Windows choice is selected, the PMJPEG window will placed itself on top of any window that overlaps it. Whenever an image is loaded or resized, the Resize Window to Fit Image option will cause the PMJPEG window to resize itself to fit the displayed image. If the image is larger than the desktop, the window size is chosen such that it fits on the desktop, and the scroll bar(s) are enabled to let you view the portion of the image that doesn't fit on the desktop. The last two options, Restore Window if Minimized and Move Window to Upper-Left Corner of Desktop, are effective after an image is loaded and they are self-expalantory. ΓòÉΓòÉΓòÉ 7.5.7. JPEG Options ΓòÉΓòÉΓòÉ The Quantization options are applied when Maximum Color Depth is set to 8-bits per pixel or less. 2-pass quantization(specifically, Heckbert) calculates the optimal colormap for the quantized image and produces better looking output than 1-pass quantization. 1-pass quantization is slightly faster because a fixed colormap is used. Dithering is the process of rendering an image on a display that supports less than the number of colors in the image. Floyd-Steinberg Dithering, an error diffusion method, should be turned on when your display is not truecolor(24-bit) and when Maximum Color Depth is set to the number of colors supported by your display driver. The Quality Factor, an integer between 0 and 100 inclusive, determines the tradeoff between the output file size and the output image quality. If you choose a high quality factor, the image quality will be high but the file size will be large. A lower quality setting will yield a smaller file at a cost of lower fidelity. Since the JPEG algorithm is lossy, a quality factor of 100 will not give you a losslessly compressed image. The Smoothing Factor, also an integer between 0 and 100 inclusive, determines the degree of smoothing to apply to an image before compressing that image with JPEG. The higher you set the factor, the higher the degree of smoothing that is applied. A smoothing factor of 0 means that no smoothing is performed. Smoothing removes noise introduced when an image is dithered, and, in turn, smoothing produces a smaller JPEG file. It should be used for only dithered images, like photographic GIF pictures. Generally, a factor between 10 and 50 removes the dithering noise from an image. Entropy Optimization selects an optimal Huffman table, and it produces a smaller JPEG file but it takes more time to encode the image. If PMJPEG runs out of virtual memory while it is decoding/encoding JPEG files, it will use temporary files that are created in the Path for Temporary File. ΓòÉΓòÉΓòÉ 7.5.8. Slideshow Options ΓòÉΓòÉΓòÉ The Slide Order determines the order in which the images in a slideshow list is displayed. If Forward order is selected, the images are displayed in the order in which they are listed in the slideshow dialog box. If Reverse order is chosen, the images are displayed in reverse order from the last file to the first one in the slideshow list. If Random order is selected, the files are displayed in a random order. The Slide Advancement options determine how to advance to the next image in a slideshow. In Manual mode, PMJPEG will wait until you click with the right mouse button before advancing to the next picture. In Automatic mode, there will be a user-selected time delay before the next picture is loaded. To advance to the next picture before the delay has elapsed, click on the window with the right mouse button. The Delay can be set to a value between 0 and 60 seconds. The Buffer Image Formats options allow buffering of selected image formats during a cyclic slideshow. If a type is selected, all images of that type are stored in memory after they are loaded and decompressed, and they will not be loaded/decompressed the next time they are displayed. This feature must be used in conjunction with the Cycle Slideshow option. Buffering images can use a lot of memory; if you don't have much physical memory, be certain that there is enough disk space on Window's swap drive to handle this memory usage. When a slideshow is running, the Cycle Slideshow option determines whether or not a list of images is continuously displayed in a cycle. If this option is on, the slideshow returns back to the first picture after the last one is displayed and continues to display all the images in a selected list until you abort the slideshow. The Full Screen option lets you display the images in the slideshow with the full screen as described in the View Full Screen section. ΓòÉΓòÉΓòÉ 7.5.9. Priority Options ΓòÉΓòÉΓòÉ These options let you adjust the priority of all the compute-intensive threads in case you want PMJPEG to use either more or less CPU time while it is loading, saving, or batch compressing. There are two priority classes that you can select. If you choose the Idle Time class, the threads are running only when the CPU is idle. If you choose the Regular class, the threads execute with normal priority. The Priority Level lets you change the priority level of the priority class. A priority level of 0 means that there is no change in the priority of the threads. Choosing a higher priority level gives the threads more priority. The converse is also true. ΓòÉΓòÉΓòÉ 7.5.10. Preferences ΓòÉΓòÉΓòÉ For time-consuming tasks like loading, saving, batch compressing, and mapping to system colors, PMJPEG displays a percentage that indicates how much of the task has been completed. The progress can be displayed in either a dialog box or the title bar of the PMJPEG window. For the open/save dialog, you can choose either the OS/2 standard file dialog or the PMJPEG file dialog. ΓòÉΓòÉΓòÉ 8. Keyboard Accelerators ΓòÉΓòÉΓòÉ PMJPEG lets you use the following key combinations to perform the corresponding functions. ΓöîΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö¼ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÉ ΓöéKey(s) ΓöéFunction Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDel ΓöéDelete File Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéCtrl + Ins or Ctrl + C ΓöéCopy Image to Clipboard Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéShift + Ins or Ctrl + V ΓöéPaste Image from Clipboard Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéHome ΓöéScroll Left by a Page Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéUp Arrow ΓöéScroll Up by One Pixel Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéPage Up ΓöéScroll Up by a Page Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéLeft Arrow ΓöéScroll Left by One Pixel Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéRight Arrow ΓöéScroll Right by One Pixel Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéEnd ΓöéScroll Right by a Page Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéDown Arrow ΓöéScroll Down by One Pixel Γöé Γö£ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö╝ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöñ ΓöéPage Down ΓöéScroll Down by a Page Γöé ΓööΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓö┤ΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÇΓöÿ ΓòÉΓòÉΓòÉ 9. Selecting a Region to Crop or Zoom ΓòÉΓòÉΓòÉ To select a region of the image, click on the image with the left mouse button. While holding down that button, move your mouse until the rectangle surrounds the desired region, and then release the mouse button. The dimensions of the selected region are displayed in the center of the indicated region. ΓòÉΓòÉΓòÉ 10. How to Register ΓòÉΓòÉΓòÉ If you use PMJPEG for more than 14 days, you are expected to register PMJPEG. When you register, you will receive the latest version of PMJPEG, a user manual, and a collection of JPEG images (we will put as many as we can fit on 1 1.44M 3 1/2" floppy or on 4 360k 5 1/4" floppies). Also, the registered version does not have the reminder-to-register screen at the start. The registration fee is only $20. Massachusetts residents, add 5% sales tax to the registration fee. US residents, add $4 for shipping and handling; non-US residents, add $8 for shipping and handling. If you want PMJPEG e-mailed to your account instead of having it physically mailed to you, there is no extra shipping charge. If you are paying with a Visa or MasterCard, add 10% to this subtotal. The 10% is the processing fee that we get charged for credit card transactions. Updates are free but the shipping charge described above applies to updates. Users who register PMJPEG and provide an e-mail address will automatically receive updates via e-mail. For e-mail registrations, you need to use a program called "uudecode" to decode the uuencoded file that we e-mail to you. For your information, a uuencoded file is a binary file that is converted to text by a program called "uuencode". If your mail system rejects large messages, we will split the uuencoded file into smaller parts before mailing the parts to you, and you will need to edit the messages with a text editor before you can decode them. Compuserve, for example, does not permit large e-mail messages. Also, the uuencoded file is rather large; it is approximately 300k. Compuserve users may find it less expensive to receive PMJPEG via U.S. Mail. Registrations with the incorrect fee, non-US currency, or drawn on a non-US bank will be returned. To register, complete the order form. and send payment to: PVS Attn: Norman Yee 58 Chandler St. Boston, MA 02116 U.S.A. Registration of PMJPEG is based on "personal usage." Corporate or organizational users must register all copies used on an individual basis; a specific person (name) must be explicitly assigned to each registrant who will be provided with a personalized copy of PMJPEG. Registration grants a specific person (not an organization or corporate entity) the right to use PMJPEG. Although we will try to mail your copy of PMJPEG 1-3 weeks after we receive your registration, please allow up to 4-6 weeks for delivery. ΓòÉΓòÉΓòÉ 11. Order Form ΓòÉΓòÉΓòÉ ORDER FORM Name: ______________________________________________________________ Company: ___________________________________________________________ Address: ___________________________________________________________ City: _____________________ State: ________ ZIP: _________________ Country (if outside US): ___________________________________________ Phone Number (optional): _____________ Circle: home or work Shareware Version of Program evaluated (optional): _________________ Where you found Shareware Version (optional): ______________________ Product Quantity Price Each Total =================================================================== PMJPEG for OS/2 2.x and Warp ____ $20.00 U.S. _____ WinJPEG for Windows 3.x ____ $25.00 U.S. _____ WinJPEG Update Fee (from any registered version of WinJPEG) ____ $5.00 U.S. _____ Murals for Windows 3.x ____ $15.00 U.S. _____ =================================================================== Merchandise Total: ______ 5% Sales Tax (Massachusetts residents only): ______ Shipping and Handling (choose one): ______ __ E-mail (no additional charge) __ U.S. residents ($4 U.S.) __ Non-U.S. residents ($8 U.S.) Subtotal: ______ Prices above reflect a 10% cash discount; for Visa/MasterCard Orders, add 10% of Subtotal: ______ TOTAL: ______ (Non-credit card order payments must be in U.S. cash, U.S. funds drawn on a U.S. bank, or a postal money order) Please fill in the following for Credit Card Orders: Signature: _______________________ Name on Card: ____________________ Visa [ ] MasterCard [ ] Credit Card Number: ___________________ Expiration Date: _______ Choose Disk Size (check one if you did not select "E-mail" for shipping): __ 4 5 1/4" DS/DD (360K) disks __ 1 3 1/2" DS/HD (1.44 Mb) disk E-mail Address (optional except E-mail Shipping): _________________ Circle Type of Email Address: Internet Compuserve AOL Delphi (Compuserve, AOL, and Delphi users, please be aware that a PMJPEG E-mail registration can be sent to you in over 8 uuencoded parts and requires a program called uudecode to convert the uuencoded text back to a binary file.) Mail to: Internet Address: PVS Norman Yee nyee@netcom.com 58 Chandler St. Boston, MA 02116 U.S.A. ΓòÉΓòÉΓòÉ 12. Reporting Bugs ΓòÉΓòÉΓòÉ If you find a bug in PMJPEG, we would appreciate it if you would inform us of the bug through our e-mail account: nyee@netcom.com When you send us a bug report, include a description of the procedure for reproducing the bug and a description of your system configuration(hardware and software). ΓòÉΓòÉΓòÉ 13. License Agreement (applicable to registered users) ΓòÉΓòÉΓòÉ You are licensed to single-copy use of PMJPEG; this means that you can install your registered version of PMJPEG simultaneously on one computer at work, one computer at home, and one portable computer, if only one copy is in use by the registered individual at a time. You may make copies of the registered PMJPEG disk as necessary for normal backup purposes; you agree not to make any copies of the printed PMJPEG manual or the registered version of PMJPEG for others. If you are going to install PMJPEG on a LAN server, you may install PMJPEG on only one compute or network server and concurrently have a single user access PMJPEG from such network. ΓòÉΓòÉΓòÉ 14. Disclaimer ΓòÉΓòÉΓòÉ The authors of this program accept no responsibility for damages that are caused by this program and make NO WARRANTY or representation, either express or implied, with respect to this software. This software is provided "AS IS," and you, its user, assume the entire risk when you use it. ΓòÉΓòÉΓòÉ 15. Acknowledgments ΓòÉΓòÉΓòÉ PMJPEG is based in part on the work of the Independent JPEG Group. TIFF support in PMJPEG is based in part on Sam Leffler's TIFF library. Windows is a trademark of Microsoft Corporation. OS/2 is a trademark of International Business Machines Corporation. The Graphics Interchange Format(c) is the Copyright property of CompuServe Incorporated. GIF(sm) is a Service Mark property of CompuServe Incorporated. GIF2JPG and Image Alchemy are trademarks of Handmade Software, Inc. WinJPEG is copyright (C) 1992-1994, Norman Yee and Ken Yee. All rights reserved. PMJPEG is copyright (C) 1993, 1994 Norman Yee and Ken Yee. All rights reserved. o Copyright Notice for Sam Leffler's TIFF Library ΓòÉΓòÉΓòÉ 15.1. Copyright Notice for Sam Leffler's TIFF Library ΓòÉΓòÉΓòÉ Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994 Sam Leffler Copyright (c) 1991, 1992, 1993, 1994 Silicon Graphics, Inc. Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that (i) the above copyright notices and this permission notice appear in all copies of the software and related documentation, and (ii) the names of Sam Leffler and Silicon Graphics may not be used in any advertising or publicity relating to the software without the specific, prior written permission of Sam Leffler and Silicon Graphics.