NAME
im_gammacorrect - carry out gamma correction
SYNOPSIS
#include <vips/vips.h>
int im_gammacorrect(in, out, exponent)
IMAGE *in, *out;
double exponent;
DESCRIPTION
im_gammacorrect performs gamma correction to in. The result in written
in out. The correction is carried out by creating a lookup table using
the double exponent and mapping in through it. The exponent is applied
on a ramp lut and the resultant lut is scaled. All channels of im are
mapped through the lookup table.
SEE ALSO
im_histgr(3), im_heq(3), im_histeq(3), im_identity(3), im_maplut(3)
COPYRIGHT
N. Dessipris
AUTHOR
N. Dessipris - 10/05/1991
10 May 1991 GAMMA(3)