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.