Re: question on armhf color depth
Color depth is a deep subject (couldn't resist). Different windows
(every X program technically has it's own window) can run at different
depths even right next to each other. Programs request a depth from X
or the window manager, not to mention a color map and graphics
context. If you have xwininfo (command line program so it's not in
menus) try it a little:
pi2# xwininfo
xwininfo: Please select the window about which you
would like information by clicking the
mouse in that window.
xwininfo: Window id: 0x300008c "Gmail - question on armhf color depth
- Mozilla Firefox"
Absolute upper-left X: 35
Absolute upper-left Y: 65
Relative upper-left X: 1
Relative upper-left Y: 30
Width: 1189
Height: 870
Depth: 24
Visual: 0x21
Visual Class: TrueColor
Border width: 0
Class: InputOutput
Colormap: 0x20 (installed)
Bit Gravity State: NorthWestGravity
Window Gravity State: NorthWestGravity
Backing Store State: NotUseful
Save Under State: no
Map State: IsViewable
Override Redirect State: no
Corners: +35+65 -696+65 -696-145 +35-145
-geometry 1189x870+34+35
The Pi seems to make more use of a frame buffer than machines with
separate video cards. Devoting more RAM to the GPU in raspi-config
may have a little effect, I have 64 megs. A frame buffer is
memory-mapped video you can actually write into. fbset may show you
something:
pi2# fbset
mode "1920x1080"
geometry 1920 1080 1920 1080 32
timings 0 0 0 0 0 0 0
rgba 8/16,8/8,8/0,8/24
endmode
Tvservice probably won't tell you much useful:
tvservice -s
state 0x12000a [HDMI CEA (16) RGB lim 16:9], 1920x1080 @ 60.00Hz, progressive
I noticed a color depth problem early on which went away and I didn't
keep good enough notes to know what caused it. I tend to attribute it
to more video RAM but I remember playing with fbset and /etc/fb.modes
(both have man pages). I remember being sure I was seeing 16 bit
color instead of 24. It's fine now, I'm in Gimp several times most
days, and I'd notice the banding across real-world color gradients
surfing the web. I'm on this thing maybe 10-12 hours a day. I still
have a couple i386 machines running but I find myself only using them
a few times a week lately.
Highlight detail might be gamma too. If you look at real-world photos
of something like a face or an apple the transitions in color won't be
smooth with a lack of color depth.
On 4/9/17, Gene Heskett <gheskett@shentel.net> wrote:
> Grettings all;
>
> raspbian jessie on a pi-3b.
>
> Specifically, can it be set to use more bits?
>
> Several of the programs I run on the pi, have much greater highlight
> detail when running on an x86 machine, and this lack of adequate color
> depth makes a pulldown menu lose its outline borders, so its difficult
> to see if the correct item is about to be clicked on. I've trolled thru
> the setup menu's w/o finding such a configuration option that seems to
> affect this.
>
> Thanks all.
>
> Cheers, Gene Heskett
> --
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> Genes Web page <http://geneslinuxbox.net:6309/gene>
>
>
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