jimp-dev/jimp

CMYK Source Saved as RGB

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#1,030 opened on Jul 22, 2021

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 (0 comments) (0 reactions) (0 assignees)JavaScript (13,218 stars) (785 forks)batch import
enhancementhelp wanted

Description

Expected Behavior

maintain color mode on save

Current Behavior

CMYK TIFF saved as JPG is RGB

Failure Information (for bugs)

A CMYK TIFF file read then saved as JPG is saved in RGB.

I have read a number of conflicting statements regarding the support for CMYK - one stated that jpeg-js does not support CMYK, which seems untrue (at least currently) - so how does jimp specify which mode for jpeg-js to save in?

Contributor guide

Tech stack
javascriptnodejs
Domain
backend
Issue type
bug
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.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Basic JavaScriptFamiliarity with image color spaces
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50
Research direction
Investigate how Jimp handles color mode during save, specifically for JPEG output. Review the write method and how it interacts with jpeg js. Check if jpeg js supports CMYK and if Jimp explicitly sets the color mode. Look at the image object's mode property and how it's passed to the encoder. Consider adding a test case for CMYK TIFF to JPEG conversion.