jimp-dev/jimp

Autorotate based on exif not working

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#920 opened on Jul 30, 2020

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 (7 comments) (6 reactions) (0 assignees)JavaScript (13,218 stars) (785 forks)batch import
bughelp wanted

Description

Both in the browser and in node, Jimp is not autorotating based on exif. I'm using Jimp.read(buffer), does autorotate not work with buffers?

Here's the typescript code let image = await Jimp.read(buffer); let photo = await image.cover( 1920. 1920, Jimp.HORIZONTAL_ALIGN_CENTER | Jimp.VERTICAL_ALIGN_MIDDLE, ); buffer = await photo.getBufferAsync(Jimp.MIME_JPEG);

the buffer then contains an image with the rotation exif information stripped out, but not rotated properly. This also happened on 0.13.0.

Contributor guide

Tech stack
javascriptnodejs
Domain
backendfrontend
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
Basic JavaScriptJimp API knowledge
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate the `autorotate` method in Jimp's source, specifically how it handles EXIF data from buffers. Check if the issue is related to buffer input vs file path, and look at the EXIF parser integration. Consider whether the rotation was applied but orientation flag not updated, or if the EXIF data is not being read correctly from buffers.