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- ***************************
- *** TEST SCREENS v. 2.5 ***
- ***************************
-
- Release Date of this version:
- *****************************
- 28th September 1999
-
- Author:
- *******
- Johannes Wallroth, Berlin, Germany
-
- This program is FREEWARE, enjoy!
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-
- How to use it:
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- Keys F2 .. F8 switch between the various test modes.
- Some test modes use 2 sec. time loops for changing
- between different sub-modes.
-
- ENTER key switches to next screen, SPACEBAR turns automatic
- mode off/on (the 2 second time loop for the sub-modes),
- any other key returns to main screen,
- ESC ends the program.
-
- If you have any suggestions or questions about this program,
- mail me at "watson@programming.de"
-
- Visit my homepage: "www.programming.de"
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- Note: this program is designed to help monitor USERS.
-
- Before making any comparisons, your monitor should be ON for
- at least 20..30 minutes.
-
- How to use the different tests:
-
- Intro Screen:
- Use this test pattern to check picture size and position, sharpness and convergence,
- and to adjust brightness and contrast. You should adjust the picture size and position to make
- the greatest possible use of your monitor screen size.
- The small text and the patterns should be clear and sharp, even in the corners.
- For more detailed information, follow the instructions for the respective test patterns.
-
- Resolution (F2)
- The pixel resolution of the image is specified by means of (a) the number
- of pixels in each horizontal row, which is the same as how many vertical lines it is
- possible to see (if the horizontal resolution is 800 it is possible to see 400 white/black
- lines [1pixel/1pixel]), and (b) the number of pixels in each vertical column on the screen,
- which is the same as how many horizontal lines it is possible to see (if the vertical
- resolution is 600 it is possible to see 300 white/black lines) [1pixel/1pixel]).
-
- The nominally used formula is H x V. Examples:
- 640 x 480 -> 307 200 addressable pixels.
- 800 x 600 -> 480 000 addressable pixels.
- 1600 x 1200 -> 1 920 000 addressable pixels.
- The most popular resolutions are 640x480, 800x600, 832x624, 1024x768, 1152x870, 1280x1024,
- and 1600x1200.
-
- MoirΘ (F3)
- MoirΘ is a natural interference phenomenon that appears on all colour monitors.
- It is due to an interference between the shadow mask (or aperture grill) and the resolution
- used. Look for waves, wisps, bundles and shimmers of intensity variations.
- To reduce moirΘ, change the image size to make it less noticeable, or reduce the resolution.
-
- Convergence (F4)
- What is convergence?
- A white line on the screen consists of three coloured lines: Red, green and blue. If the
- screen does not have any convergence error the lines are exactly overlaid each other, and
- the resulting colour is white. In case of a convergence error separate red, green and blue
- lines can be seen, instead of one white, you will see thin coloured fringes around the edges
- of image detail. The convergence error will vary for different locations on screen, and will
- also be different for each of the primary colours. Generally the convergence will be best
- near the centre, and worst in the corners. As you can see misconvergence also has a bad
- influence on sharpness.
- The colored lines in the pattern must be in the same line both horizontally and vertically.
- If the colors are not on the same vertical line, your monitor has horizontal misconvergence.
- If the colors are not on the same horizontal line, your monitor has vertical misconvergence.
-
- Basic Colors (F5)
- This test screen shows the basic, or primary colors of the windows GDI (graphics device inter-
- face; note: the primary colors of the GDI are not the primary colors in a common understanding.
- Primary colors are: red, green and blue. Secondary colors are magenta, yellow and cyan).
-
- These colors are part of the basic palette that Windows programs into the color register
- of every video adapter to ensure a common subset of colors is available to all programs.
- These colors should look exactly the same on each monitor/graphic card combination.
-
- (Color-red,green,blue)
-
- Black-0,0,0
- Dark gray-128,128,128
- Light gray-192,192,192
- White-255,255,255
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- Green-0,192,0
- Bright green-0,255,0
- Yellow-192,192,0
- Bright yellow-255,255,0
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- Red-192,0,0
- Bright red-255,0,0
- Cyan-0,192,192
- Bright cyan-0,255,255
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- Blue-0,0,192
- Bright blue-0,0,255
- Magenta-192,0,192
- Bright magenta-255,0,255
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- Color Scales (F6)
- This screen shows the ability of your monitor to produce the whole spectrum from very dark to
- full strength for every one of the three basic colors (red, green and blue) as well as the dif-
- ferent shades of grey.
-
- Brightness and Contrast (F7)
- There are normally two controls for setting the light output of a monitor. They are called the
- BRIGHTNESS and CONTRAST controls respectively. The brightness control is used to adjust the
- video signal's zero-level to equal black on the monitor screen. The contrast control is then
- used to set the amplification of the video signal, or in practice to set the light output on
- the monitor screen to a comfortable level. The brightness control is used to adjust the low
- light output levels, and the contrast control to adjust the ratio between the low and high
- level light outputs. Both of these adjustments are influenced by the ambient light, the app-
- lication (program) being used, as well as by the operator's personal preferences.
-
- The brightness control should be used to adjust the low level light output from your monitor
- for different ambient light conditions. Use the control to increase the brightness, until you
- can see the background (the areas intended to be black) and all the dark grey squares.
- Decrease it again until you can just distinguish the dark grey squares brighter than the one
- in the middle. If you set the brightness control too high the monitor cannot produce black.
- If you set the brightness control too low (blacker than black), then the dimmer grays will be
- lost and will be reproduced as black.
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- You can use this test pattern to set the contrast control to a default position (the best
- position for all the information for which you use your screen). When you run new programs
- you should then use the contrast control to set the light output from the screen to a comfort-
- able level. Adjust the contrast control so that all big squares are visible, sharp, and clearly
- distinct, and have graduated intensities.
-
- Tip:
- It's better to set the black level a little too low, and lose some of darkest gray tones, than
- too high, and lose a black background and a good contrast between black and white.
- In Windows you shouldn't set the Contrast control too high, as your eyes will tire more quickly!
-
- High Voltage Supply Stability (F8)
- On some monitors the image expands in bright areas and contracts in dimmer areas. This happens
- because the monitor has a poor high-voltage regulation. This effect is more or less visible in
- all monitors, but normally more so in very cheap monitor models, as it is not inexpensive to
- design and manufacture a very good high-voltage regulation system. If your monitor has a very
- bad screen regulation, the picture "zooms" when you adjust the brightness control.
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