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The ilClearColour function sets the current clearing colour.
ILvoid ilClearColour( ILubyte Red, ILubyte Green, ILubyte Blue, ILubyte Alpha );
ilClearColour sets the current clearing colour to be used by future calls to ilClearImage. iluRotate and iluEnlargeCanvas both use these values to clear blank space in images, too.
ilClearImage, iluRotate, iluEnlargeCanvas