I have a HTPC with a gigabyte GA-MA78G-DS3H (amd 780g chipset) hooked up to a samsung LE46A656 LCD TV using a HDMI cable.
Unfortunately, I'm experiencing color bleeding or chroma bleeding on the windows desktop. This is most noticeable on vertical red or blue edges. If I open paint and draw some light red (R=255, G=0, B=0) vertical lines being 1 pixel in width, they do appear as dark red lines on the TV. Horizontal lines appear in light red, except the first pixel (Image how this looks on my TV: Attachment 137426
As white lines do not suffer from this problem, I assume this has to do something with the pixel format setting in catalyst. There, i have 4 options to set the pixel format:
- YCbCr 4:2:2 Pixel Format
- YCbCr 4:4:4 Pixel Format
- RGB 4:4:4 Pixel Format Studio (Limited RGB)
- RGB 4:4:4 Pixel Format PC Standard (Full RGB)
After doing a complete reinstall of catalyst 9.3, the pixel format was set to YCbCr 4:2:2. This would explain the chroma bleeding to me, as the chroma signals only have half of the resolution of the luminance signal.
But regardless, which pixel format I select in catalyst, I can't get rid of the problem. I can see no difference between YCbCr 4:2:2 and YCbCr 4:4:4. Between Limited RGB and Full RGB the black and white levels change on the picture displayed on my TV.
Reading the EDID-data of my TV using EnTech's Monitor Asset Manager (sorry, this is my first post, so I'm not allowed to post URLs yet) shows, that it supports YCbCr 4:2:2, YCbCr 4:4:4 and RGB.
As i have set all filters on my TV (100Hz, digital noise reduction, resharpening, etc.) to disabled, the effect can't be the result of a filtering mechanism in the TV. At least not of one, which can be disabled in the OSD.
Now I'm stuck with this problem and have not any clue, how I can force my HTPC and TV to display a full quality 1080p signal as I would have on a PC monitor :-(
I'll hope, one of you has a solution of this problem.
Some additional data of my setup:
- OS: Windows XP
- Catalyst version: 9.3 (9.2 had the problem, too)
- Video mode used: 1080p50 (overscan set to 0% in catalyst control center) (1080p24 and 1080p60 have the problem, too)