im_dE_fromLab(3)

NAME
im_dE_fromLab, im_dECMC_fromLab, im_dE00_fromLab - calculate colour differences

SYNOPSIS
#include <vips/vips.h>
#include <vips/colour.h> int im_dE_fromLab(in1, in2, out)
IMAGE *in1, *in2, *out; int im_dECMC_fromLab(in1, in2, out)
IMAGE *in1, *in2, *out; int im_dE00_fromLab(in1, in2, out)
IMAGE *in1, *in2, *out;

DESCRIPTION
Given a pair of images in Lab format, these functions calculate CIE76, CMC(1:1) and CIEDE2000 colour difference images. These are the basic colour difference calculators in VIPS --- other colour difference functions, such as im_dE_fromXYZ(3), are provided as a convenience to the programmer. See im_Lab2XYZ(3) for an explanation of the various colour spaces VIPS supports and how to convert between them.

RETURN VALUE
The functions return 0 on success and -1 on error.

SEE ALSO
im_col_XYZ2rgb(3), im_XYZ2rgb(3), im_dE_fromXYZ(3).

COPYRIGHT
National Gallery, 1990 - 1993

AUTHOR
J.Ph. Laurent - 2/12/1992
J. Cupitt - 21/7/93