= butteraugli(1)
:doctype: manpage

== Name

butteraugli - measuring perceived differences between images

== Synopsys

butteraugli _{image1.(png|jpg|jpeg)} {image2.(png|jpg|jpeg)} [heatmap.ppm]_

== Description

Butteraugli is a project that estimates the psychovisual similarity of two
images. It gives a score for the images that is reliable in the domain of barely
noticeable differences. Butteraugli not only gives a scalar score, but also
computes a spatial map of the level of differences.

One of the main motivations for this project is the statistical differences in
location and density of different color receptors, particularly the low density
of blue cones in the fovea. Another motivation comes from more accurate modeling
of ganglion cells, particularly the frequency space inhibition.

== Author

This manual page was written by mailto:czchen@debian.org[ChangZhuo Chen
'<czchen@debian.org>'] for the *Debian GNU/Linux system* (but may be used by
others).
