On 18/11/2017 18:40, J. van den hoff wrote:
> question am I overlooking something or is this a bug to report to the Tk developers?
Yes, this is a reportable bug (hopefully you've got a small unimportant
image that triggers this). The bug is that it shouldn't be reported as a
critical chunk as the initial letter is lower case; it ought to have
been interpreted as an ancillary chunk and ignored. (It seems that the
“iDOT” chunk type is some Apple-specific extension that isn't marked as
a proper vendor extension and nobody else knows what to do with it other
that ignore or delete it. Or sabotage it. It's theorised that it relates
to something to do with the screen resolution for HighDPI displays.)
Donal.
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Donal Fellows — Tcl user, Tcl maintainer, TIP editor.