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From: tonyg@merlin.cvs.rochester.edu (Tony Giaccone)
Newsgroups: comp.sys.mac.programmer
Subject: Printing BitMaps
Summary: 8 bit vs. 1 bit images
Message-ID: <2700@ur-cc.UUCP>
Date: 10 Aug 89 18:32:06 GMT
Sender: news@uhura.cc.rochester.edu
Reply-To: tonyg@cvs.rochester.edu (Tony Giaccone)
Distribution: usa
Organization: Univ. Roch. Center for Visual Sci.
Lines: 18



I'm trying to print a bit map to a laserwriter over appletalk, and
I'm having a rather strange problem. When I print the image directly
to the printer, I get a pattern that looks like an 8 bit images is
being interpreted as a one bit deep image. However, with the same
code if I enable background printing the bitmap prints correctly.

I'm opening a standard mac window (with newwindow), and in fact
I open two windows and copybits the bitmap in the first window
to the second, to insure that I have a valid bit map. 

Can anyone explain why the use of background printing should
make any difference???


				Tony Giaccone
				tonyg@cvs.rochester.edu