This function builds look-up tables from given contrast, brightness and gamma values.
Declaration:
 Copy Code |
|
|---|---|
AT_ERRCOUNT ACCUAPI IG_dspl_gamma_correction_LUT_build(
[IN] DOUBLE dblContrast,
[IN] DOUBLE dblBrightness,
[IN] DOUBLE dblGamma,
[OUT] LPBYTE lpLUT
);
|
|
Arguments:
| Name | Type | Description |
| 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. |
Return Value:
Returns the number of ImageGear errors that occurred during this function call.
Supported Raster Image Formats:
All pixel formats supported by ImageGear Professional.
Sample:
MFC
Example:
| Copy Code |
|
|---|---|
BYTE lut[256]; /* lookup array */
...
IG_dspl_gamma_correction_LUT_build( 2.0, 120.0, 2.0, lut );
|
|