GAMMA
Section: C Library Functions (3)
Updated: 10 May 1991
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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