(PHP 3 >= 3.0.13, PHP 4, PHP 5)
imagegammacorrect -- Apply a gamma correction to a GD image
Description
bool 
imagegammacorrect ( resource image, float inputgamma, float outputgamma )
    The imagegammacorrect() function applies gamma
    correction to a gd image stream (image) given
    an input gamma, the parameter inputgamma
    and an output gamma, the parameter
    outputgamma.