jimp-dev/jimp

Image color changed after resizing

Open

#787 opened on Sep 9, 2019

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

Description

Steps to Reproduce

const Jimp = require('jimp')

async function main() { const image = await Jimp.read( 'https://awsstage-test.s3.amazonaws.com/26836/1568007235421.jpg', ) image.quality(60).scale(0.4).write('scale1.png') }

main()

Screenshots Before Resize Inspection Quote 4-01

After Resize scale1

Context

  • Jimp Version: 0.6.0
  • Operating System: Linux 18.04
  • Node version: 10.15.1

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.
needs investigation
Prerequisites
JavaScriptNode.jsJimp basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate the color shift by examining the scaling and quality algorithms in the source code, particularly the scale() and quality() methods. Look for any known issues with color space conversion during resizing. Since there are no comments or PRs, the simplest reproducer should be tested across different Jimp versions to isolate the change.