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author Sam Lantinga <slouken@libsdl.org>
date Tue, 04 Jun 2002 22:30:40 +0000
parents e5bc29de3f0a
children 546f7c1eb755
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e5bc29de3f0a Updated from the SDL Documentation Project
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1 .TH "SDL_SetGammaRamp" "3" "Tue 11 Sep 2001, 23:01" "SDL" "SDL API Reference"
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2 .SH "NAME"
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3 SDL_SetGammaRamp\- Sets the color gamma lookup tables for the display
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4 .SH "SYNOPSIS"
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5 .PP
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6 \fB#include "SDL\&.h"
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7 .sp
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8 \fBint \fBSDL_SetGammaRamp\fP\fR(\fBUint16 *redtable, Uint16 *greentable, Uint16 *bluetable\fR);
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9 .SH "DESCRIPTION"
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10 .PP
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11 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\&.
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12 .PP
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13 This function adjusts the gamma based on lookup tables, you can also have the gamma calculated based on a "gamma function" parameter with \fISDL_SetGamma\fR\&.
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14 .PP
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15 Not all display hardware is able to change gamma\&.
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16 .SH "RETURN VALUE"
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17 .PP
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18 Returns -1 on error (or if gamma adjustment is not supported)\&.
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19 .SH "SEE ALSO"
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20 .PP
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21 \fISDL_SetGamma\fR \fISDL_GetGammaRamp\fR
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parents: 55
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22 ...\" created by instant / docbook-to-man, Tue 11 Sep 2001, 23:01