bert wrote: > > On 25.04.2008, at 15:07, Paul Fox wrote: > > unlike a traditional display, every pixel has a single color. > > given this, it seems wrong to talk about the "red channel of the > > first pixel". you either use some of that pixel, or you don't. > > in effect, the display is implementing sub-(full-color-)pixel > > rendering all by itself. (which i think is what bert was saying, > > but the "channel" thing confused me.) > > In the display memory (a.k.a. framebuffer), each pixel has a red and a > green and a blue value. I called these components "channel", which is > not entirely correct. Still, the DCON selects only the red component > of a framebuffer pixel to be displayed for a red physical pixel, the
ah! the missing piece. thanks. i was so focused on the display itself that i'd never worked backwards to think about it from the perspective of the framebuffer. > value of the green and blue components do not matter. If the 5-tap > antialising filter is enabled, then the 4 adjacent pixel's red > components are averaged, and mixed with the center pixel's red > component. Again, the green and blue components are ignored, hence I > spoke of "selecting". Makes sense? yes. > > > with the backlight off, this doesn't matter -- all pixels are the > > same color anyway. but with the backlight on in monochrome mode, > > you see a lot of color in single-pixel-width lines. if the line > > is perfectly aligned with the diagonal of the pixels, it will be > > completely colored (i just tried it), but mostly you just get a > > lesser or stronger fringing effect. > > > > for backlit ebook mode, this might not matter so much, since ebooks > > might not have a lot of diagonal single-pixel-width lines, but the > > effect is definitely there. > > > But it is greatly diminished by the antialiasing hardware filter. See > if reading > > http://wiki.laptop.org/go/Display > > clears things up. With "selecting the red channel" I meant the DCON > "swizzling" as described on that page. yes, i see. since this sub-topic came up in the context of using the backlight in e-book (monochrome) mode, are you saying that the unimplemented "swizzled not antialiased" mode would be better than either of the two modes currently available ("monochrome" and "swizzled antialiased")? paul =--------------------- paul fox, [EMAIL PROTECTED] (arlington, ma, where it's 70.7 degrees) _______________________________________________ Devel mailing list [email protected] http://lists.laptop.org/listinfo/devel
