NAME

       perceptualdiff - perceptual image comparison tool

SYNOPSIS

       perceptualdiff [options] image1 image2

DESCRIPTION

       Compares  image1 and image2 using a perceptually based image metric.  Images can be in any
       FreeImage-supported format: TIF, PNG, etc.

OPTIONS

       --verbose
              Turn on verbose mode

       --fov deg
              Field of view in degrees [0.1, 89.9] (default: 45.0)

       --threshold p
              Number of 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)

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

       --color-factor
              How much of color to use [0.0, 1.0] (default: 1.0)

       --down-sample
              How many powers of two to down sample the image (default: 0)

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

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

       --output o
              Write difference to the file o

       --version
              Print version

       OpenMP status: enabled