ImageGear Professional for Linux
IG_util_colorspace_is_premultiplied
ImageGear Professional > API Reference Guide > Core Component API Reference > Core Component Functions Reference > Utility Functions > IG_util_colorspace_is_premultiplied

This function checks whether the alpha channel in the color space is pre-multiplied.

Declaration:

 
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AT_BOOL ACCUAPI IG_util_colorspace_is_premultiplied(
        enumIGColorSpaceIDs colorSpace
);

Arguments:

colorSpace enumIGColorSpaceIDs Color space ID.

Return Value:

Returns TRUE, if the alpha channel in the color space is pre-multiplied. Returns FALSE, if the alpha channel in the color space is not pre-multiplied, or the color space does not contain an alpha channel.

Supported Raster Image Formats:

This function does not process image pixels.

Example:

 
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enumIGColorSpaceIDs colorSpace = IG_COLOR_SPACE_ID_RGBA;
AT_BOOL bPremult; /* Does color space have premult. alpha? */
bPremult = IG_util_colorspace_is_premultiplied(colorSpace);
/* bPremult is FALSE */

 

 

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