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P: New Export As gives bad results for PNG (8-bit) Smaller Size

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Explorer ,
Oct 29, 2021 Oct 29, 2021

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The new Export As gives bad results for PNG (8-bit) when reducing the color palette. This is most visible in gradients. Tested on Photoshop v23.0.0 on Windows 10.

 

Workaround: Enable Legacy Export As in Preferences.

 

Steps to reproduce problem:

  1. Create a new image
  2. Make a gradient using the Blue_24 preset (or similar, but that's the one I used).
  3. File > Export > Export As...
  4. Choose PNG, and "Smaller File (8-bit)"
  5. Result: You get a few lines through the gradient that are too bright or dark. Not good.
  6. Result if using Legacy Export As (or Save for Web): A smooth-looking gradient as expected.

 

legacy export.pngnew export.png

Full resolution/lossless screenshots attached to this post.

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correct answers 1 Correct answer

Adobe Employee , Oct 29, 2021 Oct 29, 2021
Thanks. I'll have the engineering team take a look.

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Adobe Employee ,
Oct 29, 2021 Oct 29, 2021

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I notice you're you're not embedding the color profile in the version where you're getting banding. If you check that, does it look right?


Senior Product Manager - Customer Advocacy - Digital Imaging

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Explorer ,
Oct 29, 2021 Oct 29, 2021

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Sorry, forgot to toggle that when taking the screenshot, but no. Embedding the color profile makes no difference; it's just metadata. The color values in the image file does not change, and it doesn't affect the algorithm used to reduce the color palette.

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Explorer ,
Oct 29, 2021 Oct 29, 2021

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If it's not clear, I did test with and without the various boxes checked/unchecked, but it makes no difference. New Export As always gets that bad light/dark lines (not what I'd consider normal banding), while legacy export as and save for web always gets a smooth result.

Ps: In Save for Web we have control over what algorithm/settings to use (feature request for Export As!), and I tested a bunch of settings but was unable to get an error of the type seen in the new Export As. 

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Adobe Employee ,
Oct 29, 2021 Oct 29, 2021

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Thanks. I'll have the engineering team take a look.


Senior Product Manager - Customer Advocacy - Digital Imaging

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