darktable-org / darktable-org/rawspeed
Support JPEG XL compression in DNG
Open
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- Dominant language
- C++
- Stars
- 456
- Forks
- 147
- PR merge metrics
- No merged PRs in 30d
Description
Just added in DNG 1.7, and is allowed for e.g. 3-channel LinearRaw photometric interpretation.
Available (C) implementations:
https://github.com/libjxl/libjxl (reference)
https://github.com/lifthrasiir/j40 (single header, public domain)
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading the DNG 1.7 specification for JPEG XL compression and comparing the linked libjxl and j40 implementations. Then inspect rawspeed's existing DNG compression and decoder paths. Done means decoding JPEG XL-compressed DNG files, including the stated 3-channel LinearRaw case, with suitable coverage.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- computer-vision
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100