install

Additional install commands

macOS

Homebrewverified · 100%

brew install dssim

local Homebrew formula metadata

Linux

Alpine Linux apkverified · 92%

sudo apk add dssim

Alpine Linux edge package indexes · dssim · source: dl-cdn.alpinelinux.org

openSUSE zypperverified · 92%

sudo zypper install dssim

openSUSE Tumbleweed package metadata · dssim · source: download.opensuse.org

Windows

Windows Package Managerverified · 92%

winget install --id Kornelski.DSSIM -e

Windows Package Manager source index · Kornelski.DSSIM · source: cdn.winget.microsoft.com

overview

Package summary

RGBA Structural Similarity Rust implementation

Project links

Commands and aliases

dssim

history

Project history and usage

dssim is Kornel Lesinski's image dissimilarity tool and library based on a variant of SSIM, returning a perceptual difference score for PNG and JPEG images.

Project history

The README frames dssim as an improved SSIM-derived metric for practical image-compression comparison: multi-scale comparison, linear-light RGB scaling, Lab color space, alpha support, color profiles, multicore execution, and C/Rust/WASM library use.

The release history shows an early 1.x Rust API era in 2015 and 2016, followed by a major Rust rewrite in 2.8.0 on 2017-11-10. That rewrite emphasized safer code, full-resolution chroma comparison, linear-light premultiplied-alpha scaling, and acknowledged PNG-only/color-profile limitations at the time. Later 3.x releases improved packaging, WASM compatibility, and performance.

Adoption history

dssim is used by image codec and optimization developers who need a perceptual comparison metric rather than byte equality or plain RGB error. The README explicitly discusses comparing codecs either at equal file size or equal DSSIM score.

The tool is packaged by Homebrew, Alpine, openSUSE/zypper, and Windows winget; its README also mentions Homebrew and Ubuntu Snap availability. Homebrew analytics showed 187 installs over the preceding 365 days during this batch.

How it is used

Typical usage is `dssim original.png modified.png`, optionally comparing many modified images against one original or writing a visual difference image with `-o`. The README warns users to quote the dssim version because the score scale has changed between versions.

Why package nerds care

dssim is package-nerd significant because it packages an image-quality metric as both a CLI and reusable native/WASM library. It sits in the practical space between academic SSIM papers and real package-manager workflows for codec benchmarking, regression tests, and image optimization.

Timeline

2015-12-05: 1.2.0 introduced Rust API compatibility and improved sRGB gamma precision.
2016-05-09: 1.3.x releases were published with precision, stdin, gamma, and PNG-handling fixes.
2017-11-10: 2.8.0 was published as a major Rust rewrite.
2022-09-18: 3.2.3 was published with WASM compatibility and performance improvements.
2025-03-05: 3.4.0 was published with another performance improvement and is the Homebrew stable version recorded for this batch.

Related projects

SSIM is the underlying perceptual-similarity algorithm family linked from the README.
TID2013 is the image-quality dataset used in the README's accuracy table.
docs.rs hosts the Rust library documentation linked from the README.
Image codec and compression benchmarking tools are natural neighbors because the README focuses on fair image-compression comparison.

Sources

security posture

Risk level: green

narrow executable package without higher-risk signals.

Risk classifier

green risk · low confidence · appliance

Why

narrow executable package without higher-risk signals

Signals

metadata:no-higher-risk-signals

Install behavior

No Homebrew post-install hook is recorded in formula metadata.
Homebrew bottle metadata is available for 8 platform targets.
Build metadata lists 1 build dependencies.

Recommended review

Before unattended agent use, check whether the tool reads plaintext credentials, writes remote state, publishes artifacts, or shells out to plugins.

executables

Installed executables

Command	Kind	Exposure	Note
`dssim`	cli	global executable

freshness

Version and freshness

These signals separate page generation age, package-manager activity, and upstream release comparison. Version lag is warned only when an evidence URL and comparable versions are present.

page generated2026-07-08

manager version3.4.0

manager updated2026-06-15

local dataok

upstreamcurrent

latest detected3.4.0

https://github.com/kornelski/dssim

okNo freshness warnings were generated.

install metadata

Package metadata

Package key	brew:dssim
Version	3.4.0
Package manager	Homebrew
Package manager page	https://formulae.brew.sh/formula/dssim
Homepage	https://kornel.ski/dssim
Repository	https://github.com/kornelski/dssim
Upstream docs	https://github.com/kornelski/dssim#readme
License	AGPL-3.0-or-later
Source archive	https://github.com/kornelski/dssim/archive/refs/tags/3.4.0.tar.gz
Last updated	2026-06-15T10:20:15-04:00
Pulse	updated
Build dependencies	rust
Bottle	available (on arm64_linux, arm64_sequoia, arm64_sonoma, arm64_tahoe, arm64_ventura, sonoma, ventura, x86_64_linux)
Homebrew post-install	not defined
Service	none declared

registry facts

Source database details

Source Database	Homebrew formula API
Tap	homebrew/core
Full Name	dssim
Version Scheme	0
Revision	0
Bottle Stable Root URL	https://ghcr.io/v2/homebrew/core
Deprecated	no
Disabled	no
Keg Only	no
URL Keys	stable

source database matches

Other package-manager records

Matches are pulled from external package-manager indexes and kept separate from local Automic Vault package links.

apk95%

dssim 3.4.0-r0

Tool for image similarity comparison, simulating human perception

https://kornel.ski/dssim

sudo apk add dssim

License: AGPL-3.0-only
Architecture: x86_64
Source Package: dssim
1 dependencies
1 provides
normalized package name match
Matched by: Dssim

Alpine Linux edge package indexes · dl-cdn.alpinelinux.org · Alpine Linux edge package indexes: dssim from https://dl-cdn.alpinelinux.org/alpine/edge/community/x86_64/APKINDEX.tar.gz

zypper95%

dssim 3.2.3-2.8

This tool computes (dis)similarity between two (or more) PNG images

https://kornel.ski/dssim

sudo zypper install dssim

License: AGPL-3.0-only and (BSD-2-Clause AND AOMPL-1.0) and Apache-2.0 and BSD-2-Clause and (MIT or Apache2) and MIT and VP8 and MPL-2.0 and Apache-2.0 WITH
Category: Productivity/Graphics/Other
Architecture: x86_64
Source Package: dssim
3 dependencies
2 provides
normalized package name match
Matched by: Dssim

openSUSE Tumbleweed package metadata · download.opensuse.org · openSUSE Tumbleweed package metadata: dssim from https://download.opensuse.org/tumbleweed/repo/oss/repodata/be8d3611d25469107f32075a1697e69ec57a2b850b42348a658cc671ad5ec2b50760d02c3e59524d50da9a11d5be799bdaffba2e166e8ca8858512e3c0bd665d-primary.xml.zst

winget95%

Kornelski.DSSIM

winget install --id Kornelski.DSSIM -e

normalized package name match
Matched by: Dssim

Windows Package Manager source index · cdn.winget.microsoft.com · Windows Package Manager source index: Kornelski.DSSIM from https://cdn.winget.microsoft.com/cache/source.msix

package graph

Links come from deterministic package relationships, av.db category and tag curation, ecosystem matches, and package hub membership.

source trail

Generated from repository data

This page is generated by av-web from the private package SQLite artifact built by scripts/generate-pkg-sqlite.py.

Combined YAML source

View the package source record on GitHub.

combined/dssim.yml

Used sources

Geiger risk classifier
Nucleus package database
av.db category and tag curation
cross-ecosystem install command graph
curated package history
external package-manager database matches
package relationship graph
package version freshness
package-page enrichment

Install dssim with Homebrew, apk, winget, zypper