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- Newsgroups: comp.graphics
- Path: sparky!uunet!sun-barr!cs.utexas.edu!wupost!usc!rpi!batcomputer!munnari.oz.au!cs.mu.OZ.AU!michaelangelo.vis.citri.EDU.AU!kelly
- From: kelly@michaelangelo.vis.citri.EDU.AU (Andrew David KELLY)
- Subject: Tseng 24-bit registers info required
- Message-ID: <9225114.7502@mulga.cs.mu.OZ.AU>
- Summary: tseng lab, 24-bit, register info required
- Keywords: tseng lab, 24-bit, registers
- Sender: news@cs.mu.OZ.AU
- Organization: Computer Science, University of Melbourne, Australia
- Date: Mon, 7 Sep 1992 04:41:39 GMT
- Lines: 36
-
- I require information on the Mega Eva/2 tseng ET4000 card.
-
- In particular I want to know the following:
-
- How to put the card in 24-bit mode.
-
- How to turn of the raster so that the screen becomes blank, without
- needing to fill the video memory with zeros (or blank out colour
- map)
-
- Is it possible to fit 2 640x400 256 colour images in video memory at
- once, where the 256 colours are chosen from the 16.7 million
- available colours.
-
- At the moment I am displaying images with a maximum of 64 greys,
- for our experiments this causes too much banding. I want to
- remove this banding by using 24-bit colour information, and if
- possible I want to still be able to keep two images in video
- memory at one time.
-
- Also I would like to know how to set the colour map. At the moment
- I can do this, and deliberately convert all the RGB values from
- values of 0 to 255 into values in the range of 0 to 63. I have just
- purchased a 24-bit card, and would like to know if to get the extra
- colours if I simply don't rescale the colour map and switch the card
- into a 24-bit mode, or whether it is more complicated than this.
-
- Any routines in C would be nice, but assembler is Ok.
-
- Thanks for any help.
-
- Andrew Kelly
-
- login: kelly@krang.vis.citri.edu.au.
-
-
-