William F Pokorny <ano### [at] anonymousorg> wrote:

> Aside: Because broken v3.71/v3.8/v4.0 versions do still write a gamma
> 2.2 chunk, the differences visually be will be small / hard to 'see' -
> they're at the dark end. This probably why the bug went years not
> getting picked up. It's one of those insidious subtle bugs that cause
> confusing / hair pulling results when they do bite.

Interesting.

Do you think there's a shell command that will output some unique result to
distinguish between the two types of gamma encoded png files?

If there is, maybe someone can demonstrate how to run a pre-parse/render command
to write that to a file, and then have a macro parse that and set the png read
parameters to properly/consistently adapt to however any given file is written?
(perhaps sending a message to the debug stream to ID which gamma type the file
is...)

I see that as being the best workaround for the time being.

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