---
name: "perceptualdiff"
section: "1"
platform: "linux"
package: "perceptualdiff"
version: "2.1-7"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/perceptualdiff"
---

# perceptualdiff(1)

perceptual image comparison tool

## 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