gflContrast

gflContrast

The gflContrast function increase or decrease the contrast of a picture.

GFL_ERROR gflContrast(
  GFL_BITMAP * src,  

  GFL_BITMAP ** dst,  

  GFL_INT32 contrast
);

Parameters

src: Pointer to a GFL_BITMAP structure.
dst: Address of a pointer to a GFL_BITMAP structure.
NULL if on the same instance.
contrast: An integer between -127 and 127.

Return value

The function returns GFL_NO_ERROR if it is successful or a value of GFL_ERROR.

See also

gflNegative