XO BW mode (was Re: Guidance sought on collaboration techniques)
david at lang.hm
david at lang.hm
Sat Feb 14 17:27:00 EST 2009
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:
> 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:
> 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
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
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.
More information about the Devel