[plt-scheme] empty-scene vs. nw:rectangle

From: Jordan Johnson (jmj at fellowhuman.com)
Date: Wed Oct 28 17:38:07 EDT 2009

Hi all,

Question from one of my students: Why does

   (image=? (empty-scene 200 100) (nw:rectangle 200 100 "outline" "black"))

evaluate to false?  (My best answer, without going digging into the teachpack
code, is that there's a non-visible difference somewhere in the bitmap of the


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