jimp-dev/jimp

converting tiff to jpeg returns black image with only a thin line of the very upper part of the original image

Open

#985 opened on Jan 27, 2021

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

Description

Expected Behavior

return a copy if the tiff image converted to jpeg

a jpeg image

Current Behavior

jimp returns a black image with only a thin line of the very upper part of the original image

Failure Information (for bugs)

Steps to Reproduce

Screenshots

Context

  • Jimp Version:
  • Operating System:
  • Node version:

Failure Logs

Contributor guide

Tech stack
javascript
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.
needs investigation
Prerequisites
Node.jsJimp basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
Investigate the TIFF to JPEG conversion path in Jimp. Start by examining the TIFF decoder and JPEG encoder in the source code (likely in packages/jimp/src or similar). Check if the issue is related to color space handling, alpha channel, or image dimensions. Reproduce with a sample TIFF image to isolate whether the problem is in reading TIFF or writing JPEG. Look for any existing tests for TIFF conversion and ensure the bug is reproducible with the provided code snippet.