SDL_SetGammaRamp(3) SDL API Reference SDL_SetGammaRamp(3)NAME
SDL_SetGammaRamp - Sets the color gamma lookup tables for the display
int SDL_SetGammaRamp(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);
Sets the gamma lookup tables for the display for each color component. Each table is an array of 256 Uint16 values, representing a mapping
between the input and output for that channel. The input is the index into the array, and the output is the 16-bit gamma value at that
index, scaled to the output color precision. You may pass NULL to any of the channels to leave them unchanged.
This function adjusts the gamma based on lookup tables, you can also have the gamma calculated based on a "gamma function" parameter with
Not all display hardware is able to change gamma.
Returns -1 on error (or if gamma adjustment is not supported).
SDL Tue 11 Sep 2001, 23:01 SDL_SetGammaRamp(3)
Check Out this Related Man Page
pfsgamma(1) General Commands Manual pfsgamma(1)NAME
pfsgamma - Apply gamma correction to color or gray-scale images
pfsgamma [--gamma <gamma> | --inverse-gamma <inv-gamma>] [--mul <multiplier>]
Use this command to gamma correct a stream of pfs images. Gamma correction is equivalent to raising value of R, G and B (or Y for gray-
scale images) channels to 1/gamma power. More information on gamma correction can be found at:
This command can work on color images, in which case XYZ channels are transformed to RGB space, then they are gamma corrected before they
are converted back to XYZ. For gray-scale images (only Y channel and XZ missing) gamma correction is applied only to Y channel.
Data can be multiplied by an optional multiplier before gamma correction.
Note: gamma correction will set the 'LUMINANCE' tag to 'DISPLAY' thus cancelling any sRGB correction when saving to LDR files (like PPM,
TIFF). This will also cause a warning message when saving to HDR files, because the intensities after gamma correction are not linearly
related to luminance any more.
OPTIONS --gamma <gamma>, -g <gamma>
Perform gamma correction (input^(1/gamma)). This can be used to convert images from relative luminance or radiance to pixel values.
Default value: 1.0
--inverse-gamma <inv-gamma>, -i <inv-gamma>
Perform inverse gamma correction (input^(gamma)). This can be used to convert images from pixel values to relative radiance or lumi-
--mul <mul>, -m <mul>
Multiply data by this value before gamma correction. Default value: 1
pfsin memorial.hdr | pfsgamma -g 1.8 -m 10 | pfsout memorial_gc.ppm
Multiply memorial image by 10, gamma correct it and save to memorial_gc.ppm.
SEE ALSO pfsin(1)pfsout(1)pfsdisplayfunction(1)BUGS
Please report bugs and comments to the pfstools discussion group (http://groups.google.com/group/pfstools).
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