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- Path: sparky!uunet!charon.amdahl.com!pacbell.com!ames!data.nas.nasa.gov!taligent!apple!cambridge.apple.com!lieber@MEDIA-LAB.MEDIA.MIT.EDU
- From: lieber@MEDIA-LAB.MEDIA.MIT.EDU (Henry Lieberman)
- Newsgroups: comp.lang.lisp.mcl
- Subject: Am I black-and-white yet?
- Message-ID: <9209031629.AA21411@media-lab.mit.edu>
- Date: 3 Sep 92 16:29:34 GMT
- Sender: info-mcl-request@cambridge.apple.com
- Lines: 8
- Approved: comp.lang.lisp.mcl@Cambridge.Apple.C0M
- Original-To: info-mcl@MEDIA-LAB.MEDIA.MIT.EDU
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-
- On the issue of a reliable test for a black-and-white versus color screen,
- I hit upon
-
- (real-color-equal (make-color 0 0 0)
- (make-color 32000 32000 32000))
-
- which asks "Is gray the same as black?". This seems to work.
-