Github user andrewmlim commented on the issue:
https://github.com/apache/nifi/pull/1693
I did a quick check of the optimized images and the majority of images look
great (no perceptible image degradation to my naked eye). However, for some
reason the PNGs that have a transparent background (bcrypt-salt.png, for
example) are having issues. They render fine in my browser, but get cut-off at
the bottom in Preview and a screenshot capturing tool that I use (SnagIt) on my
Mac. Maybe exclude images with transparent backgrounds for now.
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