Nick Doyle

I have downloaded and built ImageMagick 7.0.11-7 and still see the issue with this test case.

Sorry, it looks like I was commenting on an outdated view of this issue. I'll try the latest changes that have recently been added.

Thank you for the update and the effort.

Just tried this out in the new 7.0.11-8 release and the issue has gone away. Thanks again for fixing this!

I've run in to this problem again with ImageMagick 7.0.11-10. Same commands as in the original post but with this new attached image. [test_case2.zip](https://github.com/ImageMagick/ImageMagick/files/6415657/test_case2.zip)

After building ImageMagick with the above two commits, the test case in [test_case2.zip](https://github.com/ImageMagick/ImageMagick/files/6415657/test_case2.zip) works but the test case in [test_case.zip](https://github.com/ImageMagick/ImageMagick/files/6279881/test_case.zip) is broken again.

Using ImageMagick 7.0.11-12, it looks like the catastrophic issues when using `-layers Optimize` have been fixed for both input images. Thank you! For the `input2.miff` case, though, I see artifacts...

If I use `-layers Optimize`, I see these edge artifacts for all three dithering options. If I don't use `-layers Optimize`, I don't see any of these edge artifacts. In...

These formats are listed here, so if they aren't permitted there is at least a documentation bug: ``` % magick -list format Format Module Mode Description ——————————————————————————————————————— … B* RAW...

``` % magick -version Version: ImageMagick 7.0.10-55 Q16 x86_64 2021-01-05 https://imagemagick.org Copyright: © 1999-2020 ImageMagick Studio LLC License: https://imagemagick.org/script/license.php Features: Cipher DPC HDRI Delegates (built-in): bzlib freetype heic jng jp2...