IG_dspl_gamma_correction_LUT_build

ImageGear for C and C++ on Windows v20.0 - Updated

IG_dspl_gamma_correction_LUT_build

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API Reference Guide > Core Component API Reference > Core Component Functions Reference > Display Functions > IG_dspl_gamma_correction_LUT_build

This function builds look-up tables from given contrast, brightness and gamma values.

Declaration:

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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 );

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 for C and C++.

Sample:

MFC

Example:

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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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