Subject: RE: [stella] Flicker-free background demo From: "Lee Fastenau" <stella@xxxxxxxxxxxxxxx> Date: Mon, 3 Jan 2005 08:16:48 -0600 |
> Here's a demo of flicker-free background graphics. These are 4K images > which should be viewed on actual hardware rather than emulators. On > actual > hardware this system has no flicker. As you can see from the sample > images, > I'm playing with something that just looks like BoulderDash but isn't > actually BoulderDash. Isn't anyone going to ask how it's done :) ?! > Cheers > A My 2600 isn't hooked up yet (since a major desk reconfiguration), but judging from what I'm seeing in Z26, every third line switches between each of the following color pairs at 60Hz (or 50Hz), allowing for a distinct secondary color: R <-> G (Yellow) G <-> B (Cyan) B <-> R (Magenta) The clear, non-flickering primary and secondary colors lay the groundwork for easily perceived additional colors, including white. The nice thing about this method is that no colors are represented by only 1 of 3 rows, so striping isn't as bad as, say Spasticolor. Example: R <-> <-> (Only one black line out of three) <-> R And secondary colors are represented by all three lines, with one line being the solid color generated with imperceptible flicker and the other two using proximity to "suggest" the secondary color: R <-> G (Yellow) G <-> <-> R (Lines 2 and 3 suggest Yellow) The only questions that remain for me are: Isn't every other frame of a 60Hz (50Hz) display shown offset by half a scanline (interlaced)? Isn't that how Spasticolor operated? Does your method actually flicker at 30Hz? Thanks for sharing! :) -Lee
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