On Sat, 14 Feb 2009, Gary C Martin wrote: > On 14 Feb 2009, at 10:16, Bert Freudenberg wrote: > >> >> The blur you see in color mode is the DCON performing anti-aliasing >> by adding color components from the four neighboring pixels into >> each pixel (e.g., for a red pixel it takes the red components of the >> surrounding pixels into account, etc). >> >> In early DCON drivers it was possible to toggle the anti-aliasing >> independently of the backlight intensity, so you could clearly see >> its effect. IIUC this capability has now been coupled to the >> backlight intensity, which is fine in regular use, but takes away >> the possibility to easily demonstrate what's happening. > > You do appear to be wrong here. Have access to three XOs here (two MP > and one B4) that all happily respond to the below command: > > su > echo 1 > /sys/devices/platform/dcon/output > > Disables colour while leaving the backlight setting alone, allowing a > slightly crisper BW display with backlight on if you want it (close > look at text edges reminds me of the little colour pixels you get with > sub-pixel resolution tricks on conventional screens), and: > > su > echo 0 > /sys/devices/platform/dcon/output > > Enables colour while leaving the backlight setting alone, allowing a > 'colour display' mode when the backlight is potentially off (not a > very useful combination as it's the backlight that goes through the > colour layer so you're left looking at a slightly soft BW image from > just reflected light).
the acceptability of the result is going to depend greatly on what you are displaying. if you have black text on a white background disabling the color bluring mode (anti-aliasing, whatever you want to call it) works pretty well. however, if you have white text on a black background you end up with a rainbow instead of a readable display. the worst case I saw of this was a graph display (I think it was an audio program, but I don't remember which one). it drew a thin white line on a black background, when disabling the color mode and leaving the backlight on each pixel of the graph was a different color and it really showed up that way. however, when you do the black lines on a white background there appears to be enough other colors around that your eyes still see the lighted pixels as white and the black lines look pretty good. David Lang _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
