.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.48.1.
.TH PERCEPTUALDIFF "1" "April 2021" "perceptualdiff 2.1" "User Commands"
.SH NAME
perceptualdiff \- perceptual image comparison tool
.SH SYNOPSIS
.B perceptualdiff
[\fI\,options\/\fR] \fI\,image1 image2\/\fR
.SH DESCRIPTION
Compares image1 and image2 using a perceptually based image metric.
Images can be in any FreeImage\-supported format: TIF, PNG, etc.
.SH OPTIONS
.TP
\fB\-\-verbose\fR
Turn on verbose mode
.TP
\fB\-\-fov\fR deg
Field of view in degrees [0.1, 89.9] (default: 45.0)
.TP
\fB\-\-threshold\fR p
Number of pixels p below which differences are ignored
.TP
\fB\-\-gamma\fR g
Value to convert rgb into linear space (default: 2.2)
.TP
\fB\-\-luminance\fR l
White luminance (default: 100.0 cdm^\-2)
.TP
\fB\-\-luminance\-only\fR
Only consider luminance; ignore chroma (color) in the
comparison
.TP
\fB\-\-color\-factor\fR
How much of color to use [0.0, 1.0] (default: 1.0)
.TP
\fB\-\-down\-sample\fR
How many powers of two to down sample the image
(default: 0)
.TP
\fB\-\-scale\fR
Scale images to match each other's dimensions
.TP
\fB\-\-sum\-errors\fR
Print a sum of the luminance and color differences
.TP
\fB\-\-output\fR o
Write difference to the file o
.TP
\fB\-\-version\fR
Print version
.PP
OpenMP status: enabled