Warning: This function is
currently not documented; only the argument list is
available.
Warning: This function is
EXPERIMENTAL. The behaviour of this function, the
name of this function, and anything else documented about this
function may change without notice in a future release of PHP.
Use this function at your own risk.
Gamma-corrects an image. The same image viewed on different devices will
have perceptual differences in the way the image's intensities are
represented on the screen. Specify individual gamma levels for the red,
green, and blue channels, or adjust all three with the gamma parameter.
Values typically range from 0.8 to 2.3.
Return Values
Returns TRUE
on success.