golang/go

image: support LJPEG

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#22,535 opened on Nov 1, 2017

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Description

Please consider adding support for Lossless JPEG (SOF3, aka LJPEG). This format is used in medical imaging (DICOM) and RAW files of digital cameras (DNG). An argument for this to be in standard library is that most of the required parts are already in place (JPEG parser, Huffman coding), whereas an external library would need to replicate those private methods.

Contributor guide

Research direction
Examine the existing JPEG decoder in the image/jpeg package and adapt it to handle Lossless JPEG (SOF3) by extending the Huffman coding and bitstream handling.
Tech stack
go
Domain
api
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GoJPEG format knowledge
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30