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- ggggaaaammmmmmmmaaaarrrraaaammmmpppp((((3333GGGG)))) ggggaaaammmmmmmmaaaarrrraaaammmmpppp((((3333GGGG))))
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- NNNNAAAAMMMMEEEE
- ggggaaaammmmmmmmaaaarrrraaaammmmpppp - defines a color map ramp for gamma correction
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- CCCC SSSSPPPPEEEECCCCIIIIFFFFIIIICCCCAAAATTTTIIIIOOOONNNN
- vvvvooooiiiidddd ggggaaaammmmmmmmaaaarrrraaaammmmpppp((((rrrr,,,, gggg,,,, bbbb))))
- sssshhhhoooorrrrtttt rrrr[[[[222255556666]]]],,,, gggg[[[[222255556666]]]],,,, bbbb[[[[222255556666]]]]
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- PPPPAAAARRRRAAAAMMMMEEEETTTTEEEERRRRSSSS
- _r expects an array of 256 elements. Each element contains a setting
- for the red electron gun.
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- _g expects an array of 256 elements. Each element contains a setting
- for the green electron gun.
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- _b expects an array of 256 elements. Each element contains a setting
- for the blue electron gun.
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- ggggaaaammmmmmmmaaaarrrraaaammmmpppp supplies a level of indirection for all color map and RGB
- values. For example, before the system would turn on the red gun to
- setting 238, the system looks in a table at location 238 and uses the
- value it finds there instead of 238.
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- Thus, you can use this table to provide gamma correction, to equalize
- monitors with different color characteristics, or to modify the color
- warmth of the monitor. The default setting has r[_i] = g[_i] = b[_i] = _i.
- (So at location 238 of the red, green, and blue tables, you find the
- value 238.)
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- When the system is in RGB mode and draws an object, the system writes the
- actual red, green, and blue values to the bitplanes not the indirect
- values. However, the values that you see when the system draws the
- bitmap to the screen are the indirect values: r[red], g[green], b[blue]
- (where r,g,b are the arrays last specified by ggggaaaammmmmmmmaaaarrrraaaammmmpppp).
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- Similarly, when the system is in color map mode and draws an object, the
- system knows that the true color of the object may be color _i, but to
- determine the displayed color, the system finds the red, green, and blue
- values of color _i and displays color _i as r[red], g[green], b[blue].
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- color, cmode, mapcolor, RGBcolor, gamma(6D)
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- NNNNOOOOTTTTEEEESSSS
- This routine is available only in immediate mode.
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- On the IRIS-4D G, gamma correction in RGB mode uses the top 256 entries
- of the colormap.
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- ggggaaaammmmmmmmaaaarrrraaaammmmpppp should not be used in new developement. The X server
- compensates for gamma in colors used by X clients. ggggaaaammmmmmmmaaaarrrraaaammmmpppp will bypass
- this. Use ggggaaaammmmmmmmaaaarrrraaaammmmpppp with caution or a sense of humor.
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- PPPPaaaaggggeeee 1111
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- ggggaaaammmmmmmmaaaarrrraaaammmmpppp((((3333GGGG)))) ggggaaaammmmmmmmaaaarrrraaaammmmpppp((((3333GGGG))))
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- PPPPaaaaggggeeee 2222
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