jimp-dev/jimp

rgba(false) returns garbled png

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#954 opened on Oct 16, 2020

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 (4 comments) (0 reactions) (0 assignees)JavaScript (13,218 stars) (785 forks)batch import
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Description

Expected Behavior

The alpha channel to be removed from my png without garbling it.

Current Behavior

It returns a garbled image, sans alpha channel though!

Failure Information (for bugs)

Steps to Reproduce

const Jimp = require("jimp");

let src = "icon.png";

Jimp.read(src, (err, image) => {
    if (err) {
        console.log(err);
        return;
    }
    image.rgba(false).write("result.png");
});

Context

icon result

  • Jimp Version: 0.16.1
  • Operating System: Ubuntu 18.04 & macOS 10.15.7
  • Node version: 12.7.0

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.
1-3 hours
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.
mostly clear
Prerequisites
Node.js basicsJimp library usage
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60
Research direction
Investigate the implementation of the `rgba` method in Jimp, likely in the source code (e.g., `src/index.js` or related modules). Look for recent changes that might have introduced a bug when setting `rgba(false)`. Check for similar issues or PRs and review the handling of alpha channel removal.