PERCEPTUALDIFF(1)

NAME
perceptualdiff - compare images using a perceptually based image metric

SYNOPSIS
perceptualdiff <image1> <image2> [options]

DESCRIPTION
This manual page documents briefly the perceptualdiff command.

perceptualdiff is a program that compares image1.tif and image2.tif using a perceptually based image metric. Note: Input files can also be in the PNG format

OPTIONS
A summary of options is included below.

--verbose
    : Turns on verbose mode

--fov deg
    : Field of view in degrees (0.1 to 89.9)

--threshold p
    : #pixels p below which differences are ignored

--gamma g
    : Value to convert rgb into linear space (default 2.2)

--luminance l
    : White luminance (default 100.0 cdm^-2)

--luminanceonly : Only consider luminance; ignore chroma (color) in the comparison

--colorfactor
    : How much of color to use, 0.0 to 1.0, 0.0 = ignore color.

--downsample
    : How many powers of two to down sample the image.

--scale
    : Scale images to match each other's dimensions.

--sum-errors
    : Print a sum of the luminance and color differences.

--output o.ppm
    : Write difference to the file o.ppm

Note: Input or Output files can also be in the PNG or JPG format or any format that FreeImage supports.

This manual page was written by Jeff Breidenbach <jab@debian.org>, for the Debian project (but may be used by others).