gng@spocom.UUCP (11/19/89)
Some more quick questions - Does anyone have information as to how spectrum
and quantum paint programs are able to make the ST display more colours than
usual? I'm especially bewildered as to how quantum paint can display
3375 colours or more! Any info appreciated...
--
George Ng (Computer Science, Univ. of Toronto) | "Sure, I would like Canadian
UUCP: uunet!mnetor!{becker,hybrid}!spocom!gng | winters too...if it weren't
or utgpu!ncrcan!ziebmef!spocom!gng | for the weather."scott@cs.odu.edu (Scott Yelich) (11/20/89)
Some more quick questions - Does anyone have information as to how spectrum and quantum paint programs are able to make the ST display more colours than usual? I'm especially bewildered as to how quantum paint can display 3375 colours or more! Any info appreciated... My quantum paint is pretty useless... I have not seen a conversion program from quantum's own format over to any other (gif would be best!) and so the images are neat to look at... on my atari... in quantum paint.... but besides that, they are useless. Also, my quantum paint screws up the colors whenever I get more than 30-40 of them on the screen at once! (it does that nasty recalibration and changes the colors from like green to red!) I have not used my version since that happens to me EVERY time. Scott -- ----------------------------------------------------------------------------- Scott D. Yelich scott@cs.odu.edu [128.82.8.1] After he pushed me off the cliff, he asked me, as I fell, ``Why'd you jump?'' -----------------------------------------------------------------------------
greg@sj.ate.slb.com (Greg Wageman) (11/22/89)
Opinions expressed are the responsibility of the author. In article <15@spocom.UUCP> gng@spocom.UUCP writes: > >Some more quick questions - Does anyone have information as to how spectrum >and quantum paint programs are able to make the ST display more colours than >usual? I'm especially bewildered as to how quantum paint can display >3375 colours or more! Any info appreciated... Spectrum 512 works by using the CPU to reload the hardware palette registers during the current scan line. An initial palette is loaded during horizontal retrace; then, in a *very* tight loop, each register is loaded in sequence with a new color from the Spectrum palette. Since each register is reloaded twice in the scan line, a total of 48 different colors are possible in one line. In addition, since there is an independent palette for each scan line, all 512 colors may appear within one screen. I don't know how Quantum Paint works, but I suspect they use some variation on this scheme. Copyright 1989 Greg Wageman DOMAIN: greg@sj.ate.slb.com Schlumberger Technologies UUCP: {uunet,decwrl,amdahl}!sjsca4!greg San Jose, CA 95110-1397 BIX: gwage CIS: 74016,352 GEnie: G.WAGEMAN Permission granted for not-for-profit reproduction only.