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im_gammacorrect - carry out gamma correction
#include <vips/vips.h>
int im_gammacorrect(in, out, exponent)
IMAGE *in, *out;
double exponent;
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.
im_histgr(3)
,
im_heq(3)
, im_histeq(3)
, im_identity(3)
, im_maplut(3)
N. Dessipris
N. Dessipris - 10/05/1991
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