This function builds look-up tables from given contrast, brightness and gamma values.
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AT_ERRCOUNT ACCUAPI IG_dspl_gamma_correction_LUT_build(
[IN] DOUBLE dblContrast,
[IN] DOUBLE dblBrightness,
[IN] DOUBLE dblGamma,
[OUT] LPBYTE lpLUT
);
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| Name | Type | Description |
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| dblContrast | DOUBLE | Contrast value to use in calculations. You can use any value. |
| dblBrightness | DOUBLE | Brightness value to use in calculations. Must be within the -255.0 to +255.0 range. |
| dblGamma | DOUBLE | Gamma value to use in calculations. Must be greater than 0.0, however the most useful values are in the range from 1.8 to 2.2. |
| lpLUT | LPBYTE | Pointer to 256 byte array in which to calculate the look-up table. |
Returns the number of ImageGear errors that occurred during this function call.
All pixel formats supported by ImageGear for C and C++.
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BYTE lut[256]; /* lookup array */
...
IG_dspl_gamma_correction_LUT_build( 2.0, 120.0, 2.0, lut );
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