jimp-dev/jimp

Grayscale images aren't saved as 8-bit PNGs or JPEGs

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#913 geöffnet am 17. Juli 2020

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bughelp wanted

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Beschreibung

Expected Behavior

When writing images to disk after calling greyscale() method should produce 8-bit PNGs and JPEGs.

Current Behavior

Even when greyscale() is called images are still 24 or 32 BPP. After some digging I've discovered that you can get 8-bit PNGs by leveraging the colorType() method. Unfortunately no such thing for JPEGs.

Steps to Reproduce

Jimp.read('image.png').then(image => {
  image.greyscale().write('image_greyscale.png');
});

Jimp.read('image.jpg').then(image => {
  image.greyscale().write('image_greyscale.jpg');
});

Context

  • Jimp Version: 0.14
  • Operating System: Windows 10
  • Node version: 12

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