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Top 23 C Image processing Projects
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ImageMagick
ImageMagick is a free, open-source software suite for creating, editing, converting, and displaying images. It supports 200+ formats and offers powerful command-line tools and APIs for automation, scripting, and integration across platforms.
Project mention: mochify-cli VS ImageMagick - a user suggested alternative | libhunt.com/r/mochify-cli | 2026-03-14ImageMagick is the Swiss Army knife, but Mochify is the smart surgical laser. No more memorizing a thousand flags—just tell the terminal what you want in English.
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AppSignal
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Project mention: Sharp: High performance Node.js image processing/optimization | news.ycombinator.com | 2025-12-16
Also worth mentioning libvips[0] the underlying engine behind sharp. We use the golang wrapper at work and love the simplicity and speed (ofc)
[0]https://github.com/libvips/libvips
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Project mention: yazi: Rust Terminal File Manager with Image Preview — Alacritty Fix Included | dev.to | 2026-04-21
On macOS, Überzug++'s X11/Wayland backend is disabled at compile time, so it can't overlay images. yazi automatically falls back to Chafa, which renders images using Unicode block characters inside the terminal.
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OpenEXR
The OpenEXR project provides the specification and reference implementation of the EXR file format, the professional-grade image storage format of the motion picture industry.
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Project mention: QGIS is a free, open-source, cross platform geographical information system | news.ycombinator.com | 2025-09-12
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Project mention: ASCII characters are not pixels: a deep dive into ASCII rendering | news.ycombinator.com | 2026-01-17
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NTSC-CRT
NTSC encoding/decoding in C89 using only integers and fixed point math. Supports NES decoding. Can be used as an image filter for games or real-time applications.
Project mention: Ntsc-rs – open-source video emulation of analog TV and VHS artifacts | news.ycombinator.com | 2026-06-06This one does. You can configure the noise injected into the signal and when it gets too much, it loses sync and the picture starts rolling. It's actually a software NTSC modulator/demodulator, not just an effect to simulate it.
https://github.com/LMP88959/NTSC-CRT
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PAL-CRT
PAL encoding/decoding in C89 using only integers and fixed point math. Supports NES decoding. Can be used as an image filter for games or real-time applications.
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FreeImage
A custom distribution of FreeImage, with a CMake-based build system. Used by the Athena Game Framework.
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TurboStitchGIF-HeaderOnly-Fast-ZeroAllocation-PlatformIndependent-Embedded-C-GIF-Decoder
TurboStitchGIF: A fast, header-only C GIF decoder without dynamic allocations, ideal for embedded systems and cross-platform projects.
Project mention: Show HN: TurboStitchGIF GIF decoder that lets you choose: safety or speed | news.ycombinator.com | 2026-02-22Version 1.2 introduces two LZW backends (safe bounds-checked vs unsafe turbo), micro-cache for 30-40% faster decoding, three output formats (RGB888/RGB565LE/RGBA8888), span-based turbo blit, optional 256KB RGB565 map2 for 2-pixel-at-once rendering, proper disposal method 3 support, renderer API for indexed output, safety toggles to disable checks when you need raw speed, and prefix mode to avoid symbol conflicts — all while staying 100% malloc-free on a user-provided scratch buffer.
Repo: https://github.com/Ferki-git-creator/TurboStitchGIF-HeaderOn...
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C Image processing discussion
C Image processing related posts
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Darktable
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Ntsc-rs – open-source video emulation of analog TV and VHS artifacts
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Pixelmuse CLI Guide: AI Image Generation From Your Terminal
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mochify-cli VS ImageMagick - a user suggested alternative
2 projects | 14 Mar 2026 -
Show HN: AI-generated image resizing tool (browser-based, 100% private)
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ASCII characters are not pixels: a deep dive into ASCII rendering
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ImageMagick – a free, open-source CLI for editing images
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A note from our sponsor - AppSignal
www.appsignal.com | 7 Aug 2026
Index
What are some of the best open-source Image processing projects in C? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | ImageMagick | 17,100 |
| 2 | libvips | 11,541 |
| 3 | chafa | 5,080 |
| 4 | OpenEXR | 1,818 |
| 5 | sod | 1,801 |
| 6 | grass | 1,152 |
| 7 | fpng | 984 |
| 8 | GD | 982 |
| 9 | ccextractor | 896 |
| 10 | ascii_art | 737 |
| 11 | NTSC-CRT | 572 |
| 12 | sail | 358 |
| 13 | resdet | 311 |
| 14 | jasper | 261 |
| 15 | ssocr | 223 |
| 16 | hicolor | 209 |
| 17 | PAL-CRT | 115 |
| 18 | img2ascii | 72 |
| 19 | ESP32-OpenCV-Projects | 64 |
| 20 | FreeImage | 57 |
| 21 | TurboStitchGIF-HeaderOnly-Fast-ZeroAllocation-PlatformIndependent-Embedded-C-GIF-Decoder | 49 |
| 22 | nft-generator | 14 |
| 23 | tsprite | 9 |
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