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