If I recall correctly (it's been a while since I wrote any Perl/Tk applications), the dithering is handled internally by the Tk code itself, leaving you very little control over it.
For a question this detailed and specific, I would recommend contacting the module's maintainer (e-mail address should be in the documentation), or joining the Perl/Tk mailing list. Info on that list is on the page for the Perl/Tk Module List.
--rjray
In reply to Re: Perl/Tk color dithering
by rjray
in thread Perl/Tk color dithering
by Anonymous Monk
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