michael chang wrote:

> This sounds like something that should be only created if it's set by
> the user -- e.g. a save option.  Although then it'd have to be
> specified every time, which might be annoying.  In that case, you'd
> still see the colour that acts transparent in GIMP - just not when
> it's actually edited.  That said, that might be inconvienent for those
> who use GIMP as an image viewer, and confuddle users of GAP.

IMO it could be a reasonable default to set tRNS to the currently
selected background color when saving with "keep tranparent pixels'
color" unset. This would copy the behaviour for the bKGD chunk.


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