hsieh@rscene.hac.com (Julia Hsieh) (10/23/90)
How do I use 32 bit QuickDraw? How is it different from Color QuickDraw which is documented in IM vol V? I have an image file that contains 10 bits of color that maps into 24 bits of rgb. I can generate an internal lookup table, but can't figure out how to display it in 24 bits. Is 32 bit QD documented somewhere? There is probably a real easy answer, but I can't find it. Any help would be greatly appreciated. Thanks in advance. Julia ---------------------------------------------------------------- julia hsieh My opinions are not intended to reflect hsieh@rscene.hac.com those of Hughes Aircraft Company. ----------------------------------------------------------------
rfischer@Neon.Stanford.EDU (Raymond C. Fischer) (10/25/90)
In article <11285@hacgate.UUCP> hsieh@rscene.hac.com (Julia Hsieh) writes: >How do I use 32 bit QuickDraw? How is it different from Color QuickDraw >which is documented in IM vol V? I have an image file that contains >10 bits of color that maps into 24 bits of rgb. I can generate an internal >lookup table, but can't figure out how to display it in 24 bits. > >Is 32 bit QD documented somewhere? > >There is probably a real easy answer, but I can't find it. Any help >would be greatly appreciated. Wrong. No easy answer. Fortunately, not too difficult either. 32bit CQD is a superset of 8bit CQD. The calls in IM-V still apply, but now there are a few new ones and the old ones do more. In general, the routines described in IM-V all take RGB colors already. With 32bit CQD, if the color can be displayed in 24-bit color (i.e., you have a 24-bit color card) it will be. Thus, all you have to do is set your monitor to 24-bit color and display the image as usual. This assumes you have 32bit CQD (Color QuickDraw) installed. If you have an SE/30, Mac II, IIx, or IIcx you'll need to put the 32-bit color quickdraw file in your system folder and reboot. The file has been available on system software disks since 6.0.5. Of course, I've glossed over a LOT of details. 32bit CQD is described in the first issue of Develop. The official documentation is available from APDA. Ray Fischer rfischer@cs.stanford.edu
wiechman@athos.rutgers.edu (NightMeower) (10/28/90)
One interesting point is that there have been several version of 32-bit QD. Apple has made a number of improvements and as a new version of the OS is released bugs and enhancements are added. For safety reasons the OS will only use the version of 32-bit QD that it was intended to use. For example, 6.0.5 will not allow a 6.0.2 version 32-bit QD to be loaded. So either know what you are doing or use the installer to guarantee that you do indeed get 32-bit running. Kevin -- =========================================================================== Kevin S. Wiechmann arpa: wiechman@rutgers.rutgers.edu This is only a test... for the next sixty seconds...