Description

  const buffer: ArrayBuffer = await getArrayBuffer(image)
  const jimpImage: Jimp = await Jimp.read(Buffer.from(buffer))

Error: unknown JPEG marker 494d
    at constructor.parse (decoder.js:825)
    at Object.decode [as image/jpeg] (decoder.js:1096)
    at Jimp.parseBitmap (image-bitmap.js:165)
    at Jimp.parseBitmap (index.js:400)
    at new Jimp (index.js:355)
    at _construct (construct.js:19)
    at index.js:874
    at new Promise (<anonymous>)
    at Function.push../node_modules/@jimp/core/es/index.js.Jimp.read (index.js:873)
    at FileToJimp (general_utils.ts:232)
    at async scaleToFitImage (general_utils.ts:127)
    at async scaleAndUploadImage (helpers.tsx:17)
    at async Promise.all (index 0)
    at async uploadImages (helpers.tsx:34)
    at async handleSetSelectedImagesState (use_selected_images.tsx:87)

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.

4

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-2 days

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

JavaScriptNode.jsimage processing basics

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

35

Research direction

The error occurs in decoder.js at the JPEG parsing logic. The marker 0x494d is not a valid JPEG marker. Investigate the source of this marker: it might be due to an embedded TIFF thumbnail or an image misidentified as JPEG. Check the image file's actual format. Look at the Jimp read flow: from Jimp.read to parseBitmap to decoder. Consider adding a check for common non JPEG markers or improve the error message to indicate possible file format issues. The image URL in the issue can be used for testing.