(PHP 4, PHP 5)
imagegammacorrect — Apply a gamma correction to a GD image
Applies gamma correction to the given gd image given an input and an output gamma.
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
The input gamma
The output gamma
如果成功則回傳 TRUE,失敗則回傳 FALSE。