OpenColorIO, or OCIO, is a complete color management solution geared towards motion picture production, with an emphasis on visual effects and computer animation. It provides a straightforward and consistent user experience across all supporting applications while allowing for sophisticated back-end configuration options suitable for high-end production usage.

OCIO is compatible with the ACES and is LUT-format agnostic, supporting many popular formats.

G'MIC is a full-featured framework for digital image processing. It provides several user interfaces to convert / manipulate / filter / visualize generic image datasets, ranging from 1D scalar signals to 3D+t sequences of multi-spectral volumetric images, hence including 2D color images.

The vtkdiff tool shall provide means of numerical comparison of different data arrays similar to those available in the numdiff software.

G'MIC is a full-featured framework for digital image processing. It provides several user interfaces to convert / manipulate / filter / visualize generic image datasets, ranging from 1D scalar signals to 3D+t sequences of multi-spectral volumetric images, hence including 2D color images.

G'MIC is a full-featured framework for digital image processing. It provides several user interfaces to convert / manipulate / filter / visualize generic image datasets, ranging from 1D scalar signals to 3D+t sequences of multi-spectral volumetric images, hence including 2D color images.

CharLS is a codec library that can be used to build applications that can handle JPEG-LS compliant images. In the application you are writing you can call the CharLS codec and pass it images (sometimes called raster bitmaps), to have them encoded to JPEG-LS, or JPEG-LS streams, which CharLS will decode to images.

Qimgv is a configurable Qt image viewer, with optional video support.

Nomacs is a simple to use image lounge featuring semi-transparent widgets that display additional information such as metadata, thumbnails and histograms. It is able to browse images compressed archives and add notes to images.

Nomacs includes image manipulation methods for adjusting brightness, contrast, saturation, hue, gamma, and exposure. It has a pseudo color function which allows creating false color images. A unique feature of Nomacs is the synchronization of multiple instances.

lsix lists the images in a directory by displaying their thumbnails. Images are displayed in sixel graphics. lsix automatically detects terminal features and adapts the output to offer the highest quality possible. It can usually display non-bitmap graphics, including PDF. Your terminal should be sixel capable, like xterm -ti vt340.

Viewnior is an image viewer program. Created to be simple, fast and elegant. Its minimalistic interface provides more screenspace for your images. Among its features are:

1. Fullscreen & Slideshow

2. Rotate, flip, crop, save, delete images

3. Animation support

4. Browse only selected images

5. Navigation window

6. Set image as wallpaper (Gnome 2, Gnome 3, XFCE, LXDE, FluxBox, Nitrogen)

7. Simple interface

8. EXIF and IPTC metadata

9. Configurable mouse actions

This package provides a color-correct image viewer for the terminal. Your terminal should support the Kitty Graphics protocol. If it doesn't, it should support the Sixel protocol.

qpageview provides a page based document viewer widget for Qt and PyQt. It has a flexible architecture potentionally supporting many formats. Currently, it supports SVG documents, images, and, using the Poppler-Qt5 binding, PDF documents.

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

Swayimg is a fully customizable and lightweight image viewer for Wayland based display servers. It supports the most popular image formats (JPEG, JPEG XL, PNG, GIF, SVG, WebP, HEIF/AVIF, AV1F/AVIFS, TIFF, EXR, BMP, PNM, TGA, QOI, DICOM, Farbfeld). It has fully customizable keyboard bindings, colors, and many other parameters. It also supports loading images from files and pipes, and provides gallery and viewer modes with slideshow and animation support. It also includes a Sway integration mode: the application creates an overlay above the currently active window, which gives the illusion that you are opening the image directly in a terminal window.

PIXterm shows images directly in your terminal, recreating the pixels through a combination of ANSI character background color and the unicode lower half block element. It supports JPEG, PNG, GIF, BMP, TIFF and WebP.

Überzug is a command line util which draws images on terminals by using child windows. The advantages of using Überzug are:

• No race conditions as a new window is created to display images.

• Expose events will be processed, so images will be redrawn on switch workspaces.

• Tmux support (excluding multi pane windows).

• Terminals without the WINDOWID environment variable are supported.

• Chars are used as position - and size unit.

• No memory leak (/ unlimited cache).

nsxiv is a fork of sxiv. Its primary goal is to provide the most basic features required for fast image viewing. It has vi key bindings and works nicely with tiling window managers. Its code base should be kept small and clean to make it easy for you to dig into it and customize it for your needs.

qView is a Qt image viewer designed with visually minimalism and usability in mind. Its features include animated GIF controls, file history, rotation/mirroring, and multithreaded preloading.

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.

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.

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

sxiv is an alternative to feh and qiv. Its primary goal is to provide the most basic features required for fast image viewing. It has vi key bindings and works nicely with tiling window managers. Its code base should be kept small and clean to make it easy for you to dig into it and customize it for your needs.

Überzug++ is a command line utility written in C++ which allows to draw images on terminals by using X11/Wayland child windows, sixels, kitty and iterm2.

Advantages over w3mimgdisplay:

• Support for Wayland: Sway, Hyprland, niri and Wayfire

• No race conditions as a new window is created to display images

• Expose events will be processed, so images will be redrawn on switch workspaces

• Tmux support on X11, Sway and Hyprland

• Terminals without the WINDOWID environment variable are supported

• Chars are used as position - and size unit

• No memory leak (usage of smart pointers)

• A lot of image formats supported (through OpenCV and libvips).

• GIF and animated WEBP support on X11, Sixel, Sway and hyprland

• Fast image downscaling (through OpenCV and OpenCL)

• Cache resized images for faster viewing

Quick Image Viewer is a small and fast GDK/Imlib2 image viewer. Features include zoom, maxpect, scale down, fullscreen, slideshow, delete, brightness/contrast/gamma correction, pan with keyboard and mouse, flip, rotate left/right, jump/forward/backward images, filename filter and use it to set X desktop background.