LosslessJpegDecoder is undefined

Expected Behavior

Jimp should be able to process DNG files.

Current Behavior

Jimp throws an error LosslessJpegDecoder is undefined.

Failure Information (for bugs)

import Jimp from 'jimp';

I’m using Jimp within an AWS Lambda function. When I import Jimp to perform conversion on a DNG to base64, I get the error LosslessJpegDecoder is undefined. This occurs before I perform any image processing.

I’ve found the line in jimp.js that appears to instantiate a LosslessJpegDecoder, and I can’t see where a LosslessJpegDecoder would be defined. From jimp@0.4.0, jimp.js:31737:

	if(img["t262"]==32803) // lossless JPEG (used in DNG files) is not available in JpegDecoder.
	{
		var bps = img["t258"][0], dcdr = new LosslessJpegDecoder();

I can’t find any references to LosslessJpegDecoder anywhere else in the code. Where is this supposed to come from?

I have found a snippet of code identical to the snippet above in the utif package (https://github.com/photopea/UTIF.js/blob/master/UTIF.js). I believe Jimp uses utif but I’m not sure how. It’s possible that this is utif’s problem, not Jimp’s, but since I’m not directly relying on utif I thought I would open this issue.

Steps to Reproduce

1. Import jimp in an AWS Lambda function.

Screenshots

Context

This problem occurs in an AWS Lambda function.

• Jimp Version: 0.4.0
• Operating System: AWS Lambda … probably AmazonLinux
• Node version: 8.10

Failure Logs

2018-10-24T15:00:40.166Z - error: Error in vision processing LosslessJpegDecoder is not defined

Notes

It’s possible that this is a utif problem, not a jimp problem, but since they contain some identical code I wanted to ask in both places. Thank you for your help.

[hipstersmoothie]

@rdhenderson see what i was saying? I never knew a try/catch was so scary

[hisham]

Thanks @rdhenderson. Yes it works - all that’s needed is for @jimp/type-tiff to update its utif dependency to 3.1.0.

In the meantime I just installed the latest utif as a dependency on my project and overwrote the UTIF decoder with as follows:

    Jimp.decoders[Jimp.MIME_TIFF] = (data: Buffer) => {
      const ifds = UTIF.decode(data);
      const page = ifds[0];
      UTIF.decodeImage(data, page);
      const rgba = UTIF.toRGBA8(page);

      return {
        data: Buffer.from(rgba as ArrayBuffer),
        width: page.width,
        height: page.height,
      };
    };