gifdiff
Check whether two GIF images display identically
TLDR
Compare two GIF files (exit status 0 = same, 1 = different)
$ gifdiff [file1.gif] [file2.gif]
Brief mode — exit status only, no output$ gifdiff -q [file1.gif] [file2.gif]
Ignore frame-redraw differences (frames that render identically but differ in redraw info)$ gifdiff -w [file1.gif] [file2.gif]
Use in a shell script$ gifdiff -q [file1.gif] [file2.gif] && echo "identical"
SYNOPSIS
gifdiff [-q | --brief] [-w | --ignore-redraw] gif1 gif2
DESCRIPTION
gifdiff compares two GIF image files and determines whether they display identically when rendered. Unlike a byte-wise comparison, it accounts for semantically irrelevant encoding differences (for example, different frame disposal methods that produce the same visible output).gifdiff is part of the gifsicle toolkit and is primarily useful for regression testing of GIF generators and for confirming that two differently encoded files produce the same animation.
PARAMETERS
-q, --brief
Produce no output; only return an exit status (0 if images display identically, 1 otherwise).-w, --ignore-redraw
Ignore differences that only affect how frames are redrawn. Two animations that render identically but encode redraws differently are still treated as equal.-h, --help
Print usage information and exit.-v, --version
Print the gifdiff version and exit.
INSTALL
sudo apt install gifsicle
sudo dnf install gifsicle
sudo pacman -S gifsicle
sudo apk add gifsicle
sudo zypper install gifsicle
brew install gifsicle
nix profile install nixpkgs#gifsicle
CAVEATS
gifdiff does not produce a visual diff image. For pixel-level visualization of differences use a tool like compare(1) from ImageMagick.