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><H1
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>SDL_SetGammaRamp</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN1624"
></A
><H2
>Name</H2
>SDL_SetGammaRamp&nbsp;--&nbsp;Sets the color gamma lookup tables for the display</DIV
><DIV
CLASS="REFSYNOPSISDIV"
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><H2
>Synopsis</H2
><DIV
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><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <B
CLASS="FSFUNC"
>SDL_SetGammaRamp</B
></CODE
>(Uint16 *redtable, Uint16 *greentable, Uint16 *bluetable);</CODE
></P
><P
></P
></DIV
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><DIV
CLASS="REFSECT1"
><A
NAME="AEN1634"
></A
><H2
>Description</H2
><P
>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.</P
><P
>This function adjusts the gamma based on lookup tables, you can also
have the gamma calculated based on a "gamma function" parameter with
<A
HREF="sdlsetgamma.html"
>SDL_SetGamma</A
>.</P
><P
>Not all display hardware is able to change gamma.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1640"
></A
><H2
>Return Value</H2
><P
>Returns -1 on error (or if gamma adjustment is not supported).</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN1643"
></A
><H2
>See Also</H2
><P
><A
HREF="sdlsetgamma.html"
>SDL_SetGamma</A
>
<A
HREF="sdlgetgammaramp.html"
>SDL_GetGammaRamp</A
></P
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e14743d1	1	<HTML
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	4	>SDL_SetGammaRamp</TITLE
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68	><HR
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70	WIDTH="100%"></DIV
71	><H1
72	><A
73	NAME="SDLSETGAMMARAMP"
74	></A
75	>SDL_SetGammaRamp</H1
76	><DIV
77	CLASS="REFNAMEDIV"
78	><A
79	NAME="AEN1624"
80	></A
81	><H2
82	>Name</H2
83	>SDL_SetGammaRamp -- Sets the color gamma lookup tables for the display</DIV
84	><DIV
85	CLASS="REFSYNOPSISDIV"
86	><A
87	NAME="AEN1627"
88	></A
89	><H2
90	>Synopsis</H2
91	><DIV
92	CLASS="FUNCSYNOPSIS"
93	><A
94	NAME="AEN1628"
95	></A
96	><P
97	></P
98	><PRE
99	CLASS="FUNCSYNOPSISINFO"
100	>#include "SDL.h"</PRE
101	><P
102	><CODE
103	><CODE
104	CLASS="FUNCDEF"
105	>int <B
106	CLASS="FSFUNC"
107	>SDL_SetGammaRamp</B
108	></CODE
109	>(Uint16 redtable, Uint16 greentable, Uint16 *bluetable);</CODE
110	></P
111	><P
112	></P
113	></DIV
114	></DIV
115	><DIV
116	CLASS="REFSECT1"
117	><A
118	NAME="AEN1634"
119	></A
120	><H2
121	>Description</H2
122	><P
123	>Sets the gamma lookup tables for the display for each color component.
124	Each table is an array of 256 Uint16 values, representing a mapping
125	between the input and output for that channel. The input is the index
126	into the array, and the output is the 16-bit gamma value at that index,
127	scaled to the output color precision. You may pass NULL to any of the
128	channels to leave them unchanged.</P
129	><P
130	>This function adjusts the gamma based on lookup tables, you can also
131	have the gamma calculated based on a "gamma function" parameter with
132	<A
133	HREF="sdlsetgamma.html"
134	>SDL_SetGamma</A
135	>.</P
136	><P
137	>Not all display hardware is able to change gamma.</P
138	></DIV
139	><DIV
140	CLASS="REFSECT1"
141	><A
142	NAME="AEN1640"
143	></A
144	><H2
145	>Return Value</H2
146	><P
147	>Returns -1 on error (or if gamma adjustment is not supported).</P
148	></DIV
149	><DIV
150	CLASS="REFSECT1"
151	><A
152	NAME="AEN1643"
153	></A
154	><H2
155	>See Also</H2
156	><P
157	><A
158	HREF="sdlsetgamma.html"
159	>SDL_SetGamma</A
160	>
161	<A
162	HREF="sdlgetgammaramp.html"
163	>SDL_GetGammaRamp</A
164	></P
165	></DIV
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179	ALIGN="left"
180	VALIGN="top"
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182	HREF="sdlgetgammaramp.html"
183	ACCESSKEY="P"
184	>Prev</A
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193	>Home</A
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202	>Next</A
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205	><TR
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207	WIDTH="33%"
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210	>SDL_GetGammaRamp</TD
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214	VALIGN="top"
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216	HREF="video.html"
217	ACCESSKEY="U"
218	>Up</A
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230	>