gflAdjust

gflAdjust

The gflAdjust function allows to adjust brightness, contrast & gamma of a picture.

GFL_ERROR gflAdjust(
  GFL_BITMAP * src,  

  GFL_BITMAP ** dst,  

  GFL_INT32 brightness,  

  GFL_INT32 contrast,  

  double gamma
);

Parameters

src: Pointer to a GFL_BITMAP structure.
dst: Address of a pointer to a GFL_BITMAP structure.
NULL if on the same instance.
brightness: An integer between -255 and 255.
contrast: An integer between -127 and 127.
gamma: A number between 0.01 and 5.

Return value

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

See also

gflNegative