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[bug #57335] PNG writing support appears to be broken

From: Yavor Doganov
Subject: [bug #57335] PNG writing support appears to be broken
Date: Mon, 2 Dec 2019 02:02:10 -0500 (EST)
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36

Follow-up Comment #2, bug #57335 (project gnustep):

[comment #1 comment #1:]
> the white bits where shown as black. Is this the bug you are reporting?


> What you did is switch off this conversion.

Yes, but not as a "fix", I was hoping that it might give you a clue what's
going wrong.

> And for simple data where alpha is either 1 or 0 this results in correct

I just tried with a half-transparent image (alpha 0.5) and to my surprise the
conversion is correct with current code.  But I'm afraid that "simple data" is
quite a common case, especially for icons.


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