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article explaining the 'Color Recovery' DSP used https://www.hpl.hp.com/hpjournal/95apr/apr95a6.pdf https://www.hpl.hp.com/hpjournal/95apr/apr95a6.pdf
by mzs 7y ago
article explaining the 'Color Recovery' DSP used https://www.hpl.hp.com/hpjournal/95apr/apr95a6.pdf https://www.hpl.hp.com/hpjournal/95apr/apr95a6.pdf
- rasz 7y ago3DFX used similar trick in Voodoo 3D accelerators, 24bit graphics dithered into 16bit framebuffer producing what they called "22-bit" image quality using 2x2/4x4 ordered mask https://www.vogons.org/viewtopic.php?t=36548 https://www.vogons.org/viewtopic.php?t=36548 It was very close to Nvidia 32bit color quality while sustaining/beating Nvidia 16bit speeds, until Nvidia released GeForce card and killed competition.
- FullyFunctional 7y agoBased on your link (details at the bottom) it's not the same thing at all as far as I can tell. The Color Recovery buffers a scanline and does a simple edge aware filtering on a 2x16 block, for every pixel. The Voodoo 2 doesn't appear to have a buffer. Also, the HP solution takes 8 to ~ 22 bit, a harder problem.
- rasz 7y agoSimilar. Voodoo does color recovery on chip, not in external DSP/RAMDAC, you dont need a line buffer then you have whole framebuffer in ram.
- FullyFunctional 7y agoDefinitely interesting. The article references an "HP Color Recovery Technology, HP publication Number 5962-9835E" but google can't seem to find it. I'd be interested in what the "minor adjustments required to optimize image quality" is glossing over.