DNG

From before we moved these to discussions page:

• Support Project Indigo DNG + JPG output files #2523
• Add decoding support for DNG #2475

XBM and XPM

From before we moved these to discussions page:

• Add support for decoding XBM and XPM #2410

PFM

• PFM format support #2337

Crates

• The pnm codec can be spun out into its own crates. There it could also get PFM support.
• If there's free time, I feel motivation to actually take this up. Probably.

KTX2

• KTX2 support #1664

cr2 (raw format)

• Support for opening raw image formats(cr2, nef etc.) #1630

Crates

• rawloader, 2022
• libopenraw, 2025 and provides its own C API

zif

• Support for zif file format? #1578

heic

• Heic decoding #1375

Fedora bans not just the encumbered functionality, but also the source code itself. So if you were to ever add HEIC support directly in image-rs, we wouldn't be able to use upstream image-rs tarballs anymore; […]

#1375 (comment)

Gimp XCF

• gimp XCF format (layers, channels, ..) #746

Crates

• xcf, 2023

jpeg 2000

• Support JPEG 2000 #631

Crates

• jpeg2000, 2019

PSD (Photoshop Document)

• Support (a subset of) PSD via the zune-psd crate #1896

Crates

• psd
• zune-psd

OpenRaster (.ora)

Specification at https://www.openraster.org/.

• A minimal decoder would only need to extract the composite image in /mergedimage.png (example); fully supporting the layers and how they are rendered would be much more work and may not fit well with image's data model.

JPEG XL

Could jpeg-xl be supported with jxl-rs now that Chromium has plans to implement it?