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RI2CA
Posts: 8
Joined: Wed Jun 01, 2016 7:36 pm

SOLVED: Display colors washed out on new monitor

Sun Feb 21, 2021 6:37 pm

In the past I've always used my Pis with monitors that were on the smaller side. I believe 1280x960 was the highest resolution I used. Now I have a 1920x1080 monitor and it looks great when I connect my Linux laptop (MX Linux) or my Mac Mini (Debian) but when I connect my 4GB Pi 4 (Raspberry Pi OS), the colors are washed out. Black appearing as a charcoal gray is where it's most noticeable.

--I played with various settings in /boot/config.txt but nothing worked. (I used this as a guide: https://www.raspberrypi.org/documentati ... t/video.md)
--I put in a MicroSD with Manjaro ARM and the colors looked perfect! I checked the display settings and saw that they defaulted to 1600x900, so I changed that to 1920x1080 and the colors immediately changed to that same washed out look I saw on the Pi.
--I switched back to the Raspberry Pi OS MicroSD and changed the resolution to 1600x900, thinking I might get better color as I did with Manjaro at that resolution. Unfortunately, there was no improvement in the color.
--I imaged a new MicroSD with Raspberry Pi OS to test if the color issue was the result of something I installed on the old card, but the color is off on that too.
--I'm using the official R-Pi power supply and HDMI cable. MicroSD cards are Samsung EVO Plus.

I'd love to use Raspbian OS at 1920x1080, but I can't determine the correct settings to make the colors accurate. Before I switch back to a smaller monitor, is there something else I should try?
Last edited by RI2CA on Sun Feb 21, 2021 8:08 pm, edited 1 time in total.

drgeoff
Posts: 12402
Joined: Wed Jan 25, 2012 6:39 pm

Re: Display colors washed out on new monitor

Sun Feb 21, 2021 7:35 pm

I wonder if you are experiencing the following. The computer industry often uses "black is 0 and peak white is 255" whereas the television industry has always used "black is 16 and peak white is 239".

Anyway, does the new monitor have enough range on its brightness and contrast controls to give you black blacks and bright enough whites?
Quis custodiet ipsos custodes?

User avatar
RI2CA
Posts: 8
Joined: Wed Jun 01, 2016 7:36 pm

Re: Display colors washed out on new monitor

Sun Feb 21, 2021 8:08 pm

You are my hero! Based on your comment, I went back to config.txt and tried hdmi_pixel_encoding=2

That solved the problem!

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