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- >>>>> "Gerald" == Gerald Luther Graef <ggraef@alpha1.csd.uwm.edu> writes:
- In article <4dkflg$m8u@uwm.edu> ggraef@alpha1.csd.uwm.edu (Gerald Luther Graef) writes:
-
- Gerald> I've been experiementing with NIH-image and executor. The
- Gerald> images I'm looking at are 256 shade grayscale.
- Gerald> Unfortunately, I can only get executor to display in (I
- Gerald> think) 64 colors (at least, the image looks quite muddy
- Gerald> compared to NIH-image on a Mac. Is it possible to display
- Gerald> at 256 shades? Or does it do it now and my setup is
- Gerald> wrong?
-
- The problem has to do with the way Executor accesses the Digital to
- Analog Converter (DAC) that VGA based screens use to display colors.
-
- Mat Hostetter says:
-
- ``"Standard" DACs are 6-bit, so you can get 64 visibly distinct shades of
- gray. Some DACs support 8-bit, which let you get 256 shades of gray.
- 8-bit DACs (when present) can be manipulated with a VBE 2.0 extension
- Executor doesn't yet use.''
-
- The problem is that VBE 2.0 is sufficiently new that we don't yet have
- drivers for our machines that provide that particular piece of
- functionality, so although we could put code into Executor to detect
- this extension and use it when present, we wouldn't be able to test
- it. There is a new version of UniVBE due out real soon now and that
- may change things. We hope to support 8-bit DACs (when they're
- present) by the time Executor 2 ships.
-
- Gerald> Thanks... Gerry
-
- I'm cc'ing this to "questions@ardi.com" so our question + FAQ person
- can add this to our FAQ. Thank *you* for asking.
-
- --Cliff
- ctm@ardi.com
-
-