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The iluNegative function creates a negative of the current image.
ILboolean iluNegative( ILvoid );
iluNegative creates a negative version of an image, like it was viewed as a picture negative instead of the actual picture. The effect is caused by inverting the image's colours, such as a green pixel would become purple (red-blue).
ILU_ILLEGAL_OPERATION - There is currently no image bound. Use ilGenImages and ilBindImage before calling this function.