I recently started using a 4k TV as a monitor. The video is natively 4k from the on-board Intel i7.
I noticed that I often get difficult to read text. This is even worse when I use reverse video (black bg).
Looking closer I can see that the image changes as I shift the window one pixel sideways. Seems that
I get a different image when the left margin is odd and when it is even.
I run a test:
============================
#!/bin/sh
show_color() {
x="$1"
fg="-fg $2"
eval xterm $fg $bg -geometry $geo+$((x+0))+$((y+0*dy)) $cmd &
eval xterm $fg $bg -geometry $geo+$((x+1))+$((y+1*dy)) $cmd &
eval xterm $fg $bg -geometry $geo+$((x+2))+$((y+2*dy)) $cmd &
eval xterm $fg $bg -geometry $geo+$((x+3))+$((y+3*dy)) $cmd &
}
bg='-bg black'
cmd="-e 'ls /bin/z* ; read x'"
geo='70x10'
y='200'
dy='160'
off=500
show_color $((off+0)) "rgb:ff/00/00"
show_color $((off+450)) "rgb:00/ff/00"
show_color $((off+900)) "rgb:00/00/ff"
============================
Each column is one color (r, g, b) and each row is shifted one pixel.
Examining the windows with xmag shows clean text without any artifacts.
I am not sure of the policies regarding attachments on this list, I added four small images
of a closeups of some test screens. Two are green and two are blue. Each pair is shifted one pixel
relative to its mate. The blue one is worse.
===
Images are now here:
http://members.iinet.net.au/~eyaleb/attachments/20200801/dsc08803.jpg
http://members.iinet.net.au/~eyaleb/attachments/20200801/dsc08804.jpg
http://members.iinet.net.au/~eyaleb/attachments/20200801/dsc08806.jpg
http://members.iinet.net.au/~eyaleb/attachments/20200801/dsc08807.jpg
===
Plain white text on black bg and plain black text of white bg is clean. Coloured text is problematic.
Does anyone have an idea where I can look?
TIA
--
Eyal Lebedinsky (fedora@xxxxxxxxxxxxxx)
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