[bug #59337] Using optipng compressed icons uses black instead of transparency

[Stuart Hayhurst]

URL:
  <https://savannah.gnu.org/bugs/?59337>

                 Summary: Using optipng compressed icons uses black instead of
transparency
                 Project: GNU GRUB
            Submitted by: dragon8oy
            Submitted on: Sat 24 Oct 2020 06:21:51 PM UTC
                Category: User Interface
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 
                 Release: other
         Discussion Lock: Any
         Reproducibility: Every Time
         Planned Release: None

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Details:

Using a png with transparency works fine, but when the icon is losslessly
compressed using optipng, transparency appears as black instead. This happens
regardless of the compression level / arguments used.
I've attached 2 files, `debian-compressed.png` causes the black to appear
instead of transparency, and was compressed using `optipng -o7
debian-compressed.png`
The other file, `debian.png` works fine, and isn't compressed.




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