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- <th colspan="3" align="center" id="chaptername">6. Working with Digital Camera Photos</th>
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- <th width="60%" align="center" id="sectionname">6.6. Saving Your Results</th>
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- <h3 class="title"><a id="id3427618"></a>6.6. Saving Your Results</h3>
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- <h4 class="title"><a id="id3427624"></a>Files</h4>
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- <p>
- What file format should you use to save the results of your
- work, and should you resize it? The answers depend on what you
- intend to use the image for.
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- <p>
- If you intend to open the image in Gimp again for further
- work, you should save it in Gimp's native XCF format (i. e.,
- name it something.xcf), because this is the only format that
- guarantees that none of the information in the image is lost.
- </p>
- </li>
- <li>
- <p>
- If you intend to print the image on paper, you should avoid
- shrinking the image, except by cropping it. The reason is
- that printers are capable of achieving much higher dot
- resolutions than video monitors---600 to 1400 dots per inch
- for typical printers, as compared to 72 to 100 dots per inch
- for monitors. A 3000 x 5000 image looks huge on a monitor,
- but it only comes to about 5 inches by 8 inches on paper at
- 600 dpi. There is usually no good reason to
- <span class="emphasis"><em>expand</em></span> the image either: you can't
- increase the true resolution that way, and it can always be
- scaled up at the time it is printed. As for the file format,
- it will usually be fine to use JPEG at a quality level of 75
- to 85. In rare cases, where there are large swaths of nearly
- uniform color, you may need to set the quality level even
- higher or use a lossless format such as TIFF instead.
- </p>
- </li>
- <li>
- <p>
- If you intend to display the image on screen or project it
- with a video projector, bear in mind that the highest screen
- resolution for most commonly available systems is 1600 x 1200,
- so there is nothing to gain by keeping the image larger than
- that. For this purpose, the JPEG format is almost always a
- good choice.
- </p>
- </li>
- <li>
- <p>
- If you want to put the image on a web page or send it by
- email, it is a good idea to make every effort to keep the file
- size as small as possible. First, scale the image down to the
- smallest size that makes it possible to see the relevant
- details (bear in mind that other people may be using different
- sized monitors and/or different monitor resolution settings).
- Second, save the image as a JPEG file. In the JPEG save
- dialog, check the option to "Preview in image window", and
- then adjust the Quality slider to the lowest level that gives
- you acceptable image quality. (You will see in the image the
- effects of each change.) Make sure that the image is zoomed
- at 1:1 while you do this, so you are not misled by the effects
- of zooming.
- </p>
- </li>
- </ul>
- </div>
- <p>
- See the <a href="ch02s05.html" title="5. Files">File
- Formats</a> section for more information.
- </p>
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- <div>
- <h4 class="title"><a id="id3427724"></a>Printing Your Photos</h4>
- </div>
- </div>
- </div>
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- [This needs to be written.]
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- <h4 class="title"><a id="id3427737"></a>EXIF Data</h4>
- </div>
- </div>
- </div>
- <p>
- Modern digital cameras, when you take a picture, add information
- to the data file about the camera settings and the circumstances
- under which the picture was taken. This data is included in
- JPEG or TIFF files in a structured format called EXIF. For JPEG
- files, Gimp is capable of maintaining EXIF data, if it is built
- appropriately: it depends on a library called "libexif", which
- may not be available on all systems. If Gimp is built with EXIF
- support enabled, then loading a JPEG file with EXIF data, and
- resaving the resulting image in JPEG format, will cause the EXIF
- data to be preserved unchanged. This is not, strictly speaking,
- the right way for an image editor to handle EXIF data, but it is
- better than simply removing it, which is what earlier versions
- of Gimp did.
- </p>
- <p>
- If you would like to see the contents of the EXIF data, you can
- download from the registry an <a href="http://registry.gimp.org/plugin?id=4153" target="_top">Exif Browser
- plug-in</a>. If you are able to build and install it on
- your system, you can access it as Filters->Generic->Exif Browser
- from the image menu. (See <a href="ch02s08s03.html" title="8.3. Installing New Plugins">Installing New
- Plug-ins</a> for help.)
- </p>
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