I switch to the workers list. On Tue, Oct 01, 2002 at 06:03:56PM -0400, Dan Espen wrote: > > I think we still need to work out what the new default should be. >
Yes, but I am afraid that there is no good default (but when someone choose for us as XRender do). I think the good default depends on the applications the user use. > > Olivier, I don't know if that will help, for one thing it will use > up more colors. I don't know if we discussed this before, but > the 61 color table had a lot of colors in it that were designed to > evenly fill the gaps in the perceptual (HVC) colorspace. > I believe the new > tables are optimized for gradients by spacing the colors evenly in > a linear colorcube. That can leave some pretty big gaps in > the perceptual colorspace. > Yes linear colorcube are not so good. At least I can see the grey colors gap. XRender solve this problems by adding some (but do not dither). Linear colorcubes are good for fast pointwise dithering (and not so catastrophic visually). I've read some papers this day on dithering and there are methods for dithering with an arbitrary colors map but not in "real time" (this is maybe not an obstruction with colorsets). So if we can find the gaps, we can either discover a new dithering method with the lcc + the gaps or use the lcc when dithering is needed and the lcc + the gaps if not. > Thats not to say that the 61 color color table won't turn gray > into pink or green, I've seen it do that. > > I don't know if we discussed any color theory before, I hope this > stuff makes some sense to you (perceptual and linear colorspaces). > I'm not a color expert, but I did some > study of this stuff when I came up with the original 61 colors > and the matching algorithm. The matching algorithm in Fvwm is > not the algorithm used to create the 61 color color table, since > the perceptual match algorithm is too slow for Fvwm use. > > I still have the source code for the program I used to fill in > the gaps if you're interested. > Yes of course I am really interesed! If you know some articles or good links on the subject I am intersed too. Olivier -- Visit the official FVWM web page at <URL:http://www.fvwm.org/>. To unsubscribe from the list, send "unsubscribe fvwm-workers" in the body of a message to [EMAIL PROTECTED] To report problems, send mail to [EMAIL PROTECTED]
