summer@rhea.trl.oz.au (Mark Summerfield - Switching) (12/28/89)
I wonder if someone can help me out... We have here two fairly similar Mac II's, which we wish to use for a color image transfer demonstration. In the past we have been using Mac+'s, in black and white, and I am currently upgrading the demo to include color. I am doing as much as I can 'legitimately', however since it is of paramount importance that the demonstration graphically show the transfer rate, the actual contents of the screen memory is transferred directly from one machine to the other. Since we will always know the configuration of both machines, and be able to control it, this is OK for us. My problem is duplicating the colors on the receiving machine. What I am currently doing is this: On the transmitting machine I establish the characteristics of the display by extracting them from the GDevice record obtained from getMainDevice. These include the pixel depth, the bounds of the display, and the address of the screen buffer. I then extract the color table from the GDevice's pixMap, and transmit it to the receiving machine (along with some other display characteristics). The receiving Mac then establishes its own display characteristics in like manner, and checks that it is compatible with the incoming data. If it is, it opens a window the size of the entire display (thus ensuring that after we mess up the display with the new image, we can close the window, and allow the original contents to redraw themselves). I then attempt to set the palette from the new color table by converting it from a GDevice color table to a PixMap color table (by clearing the high bit of ctFlags); assigning it a new CTSeed (using GetCTSeed); then I use NewPalette, SetPalette and ActivatePalette to assign the palette to my window. When the image arrives, it is quite obvious that the correct SET of colors is being used, but that they are being mapped incorrectly (for example, if a digitized photo of a woman's head is sent, most of the colors are skin tones, but they are all in the wrong places!) How can I completely clone the palette of a color Mac? The program works perfectly if I select 2 colors, or 2 grays from the Monitors control panel accessory. Thanks in advance... Mark Summerfield Telecom Research Laboratories (Australia). ========================================================================= "You mean, spell 'bolour' with a 'k'? Kolour! Oh yeah, never thought of that! What a silly bunt!" - Monty Python. =========================================================================