img-diff is a simple program to display differences between images.
img-diff computes the pixel by pixel difference between two images in the NTSC YIQ color space, as described in:
Measuring perceived color difference using YIQ NTSC
transmission color space in mobile applications.
Yuriy Kotsarenko, Fernando Ramos.
An electronic version is available at:
$> img-diff ./testdata/circle-0.png ./testdata/circle-1.png
$> img-diff ./testdata/func-0.png ./testdata/func-1.png
