Generated image background is grey. Potentially related to new version of gm

This wasn’t happening until a week ago or so.

I’ve noticed that ImageGraphick released a new version 7.1.0-22 a week ago, but running the convert manually generates a transparent background, instead of this ugly greyish one.

Same happens when converting to jpg, but running it manually creates a white background.

As I said, this started happening only a week ago, when I probably accidentally upgraded it using brew, and I can’t seem to install an older version (not sure how to setup paths on macos…)

Steps to reproduce

install and get a reference correct output:

brew install graphicsmagick
brew install imagemagick
convert sample.pdf output.png

and then, if you were to run this example on the same pdf, the result will have a greyed background.

screenshot of the actual pdf:

generated png:

in case it’d be useful, here are my options for the app I’m running this on:

{
    density: 96,
    saveFilename,
    savePath: destinationPath,
    format: "png",
    height: finalHeight,
    width: finalWidth,
  }

if you can’t really help me, maybe you could teach me how to install older versions of ImageGraphick so I could see if those work well?

[runwayfour]

@irgipaulius I have had the same issue and had forked the code to see if I could fix it, when I noticed that it seems better when using imagemagick vs graphicsmagick. i.e. when doing a conversion like this:

const fp = fromPath(filepath, options); fp.setGMClass(“imagemagick”); /* This being the key difference */ let r = await fp.bulk(pageIdx, false)

Hope that helps a) you fix your issue and b) the maintainers debug things if its deemed to be an issue!

[LukeBrandon]

@irgipaulius Thank you for that. I’ll have to check that out.