xzgv is a fast image viewer that provides extensive keyboard support.

This package provides a user-friendly terminal image viewer that uses graphic capabilities of terminals (Sixel, Kitty or iterm2), or 24-Bit color capabilities and unicode character blocks if these are not available.

MComix is a customizable image viewer that specializes as a comic and manga reader. It supports a variety of container formats including CBZ, CB7, CBT, LHA.

For PDF support, install the mupdf package.

ytfzf is a POSIX script that helps you find PeerTube or YouTube videos without requiring API and opens/downloads them using mpv/ytdl.

pqiv is a GTK-3 based command-line image viewer with a minimal UI. It is highly customizable, can be fully controlled from scripts, and has support for various file formats including PDF, Postscript, video files and archives.

Geeqie is a lightweight GTK+ based image viewer for Unix like operating systems. It features: EXIF, IPTC and XMP metadata browsing and editing interoperability; easy integration with other software; geeqie works on files and directories, there is no need to import images; fast preview for many raw image formats; tools for image comparison, sorting and managing photo collection. Geeqie was initially based on GQview.

gpicview is a lightweight GTK+ 2.x based image viewer. It is the default image viewer on LXDE desktop environment.

The hydrus network client is an application written for internet-fluent media nerds who have large image/swf/webm collections. It browses with tags instead of folders, a little like a booru on your desktop. Advanced users can share tags and files anonymously through custom servers that any user may run. Everything is free and privacy is the first concern.

Libpng is the official PNG (Portable Network Graphics) reference library. It supports almost all PNG features and is extensible.

FreeImage is a library for developers who would like to support popular graphics image formats like PNG, BMP, JPEG, TIFF and others.

APNG (Animated Portable Network Graphics) is an unofficial extension of the APNG (Portable Network Graphics) format. APNG patch provides APNG support to libpng.

sjpeg is a simple encoding library for encoding baseline JPEG files. It is also a command-line tool that takes PNG or JPEG images as input to produce JPEG files.

MyPaint is a simple drawing and painting program that works well with Wacom-style graphics tablets.

libjpeg-turbo is a JPEG image codec that accelerates baseline JPEG compression and decompression using SIMD instructions: MMX on x86, SSE2 on x86-64, NEON on ARM, and AltiVec on PowerPC processors. Even on other systems, its highly-optimized Huffman coding routines allow it to outperform libjpeg by a significant amount. libjpeg-turbo implements both the traditional libjpeg API and the less powerful but more straightforward TurboJPEG API, and provides a full-featured Java interface. It supports color space extensions that allow it to compress from and decompress to 32-bit and big-endian pixel buffers (RGBX, XBGR, etc.).

VIGRA stands for Vision with Generic Algorithms. It is an image processing and analysis library that puts its main emphasis on customizable algorithms and data structures. It is particularly strong for multi-dimensional image processing.

OpenJPEG-Data contains all files required to run the openjpeg test suite, including conformance tests (following Rec. ITU-T T.803 | ISO/IEC 15444-4 procedures), non-regression tests and unit tests.

Gifsicle is a command-line GIF image manipulation tool that:

• Provides a batch mode for changing GIFs in place.

• Prints detailed information about GIFs, including comments.

• Control over interlacing, comments, looping, transparency, etc.

• Creates well-behaved GIFs: removes redundant colors, only uses local color tables, etc.

• Shrinks colormaps and change images to use the Web-safe palette.

• Optimizes GIF animations, or unoptimizes them for easier editing.

Two other programs are included with Gifsicle: gifview is a lightweight animated-GIF viewer, and gifdiff compares two GIFs for identical visual appearance.

libspng is a simple C library for loading Portable Network Graphics (PNGs), intended as an easy-to-use replacement for libpng.

This package is a C library and a set of command-line tools for reading DICOM WSI files.

PerceptualDiff visually compares two images to determine whether they look alike. It uses a computational model of the human visual system to detect similarities. This allows it too see beyond irrelevant differences in file encoding, image quality, and other small variations.

libheif is an ISO/IEC 23008-12:2017 HEIF and AVIF (AV1 Image File Format) file format decoder and encoder.

OpenJPEG is an implementation of JPEG 2000 codec written in C language. It has been developed in order to promote the use of JPEG 2000, a still-image compression standard from the Joint Photographic Experts Group (JPEG). Since April 2015, it is officially recognized by ISO/IEC and ITU-T as a JPEG 2000 Reference Software.

OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information. This program also converts external formats (BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity checks and corrections.

Gpick is an advanced color picker and palette editing tool.