Hello all, sorry for opening a new thread I couldn't find a related thread...
If possible, I'd like to get some expert advice or clarification regarding an issue with the green RGB mode in my Samsung UE32F5000.
32A6AF0S in service menu.
I'm an almost total noob regarding display calibration.
Calibration settings before noticing green RGB mode issue: (by eye, no calibration equipement used)
For setbox connected to HDMI1 port of TV.
Backlight: 17 (Depends on ambient ilumination)
Color: 53 (don't remember why I put this value)
Color Tone: Warm 1
HDMI Black level: Normal
Color Space: Auto
Screen size: Screen fit
Film Mode: Auto 1 (can't see difference with Auto 2)
Dynamic Contrast: Disabled
LED Motion Clear: Disabled
Digital/MPEG Noise Filter: Disabled
Black tone: Disabled
Red Offset 20
everything else 25
Everything else untouched or at stock settings...
I recently acquired a loupe to be able to scrutinize the subpixel structure of the panel.
With the loupe I also took the opportunity to see what sort of changes were happening within the pixels when changing calibration settings... nothing worth mentioning until I looked at the RGB mode.
Selecting red or blue modes expectedly lightened up only the corresponding RGB componets of the pixels, but in green mode I noticed that besides the green subpixels also a little part of the red subpixels got slightly iluminated in an area of the screen that in non RGB mode was actually white, pure white.... only on the white area of the picture the red subpixels where lightened up...
For ilustration purposes I'll upload the following picture (I can't take a picture of mine):
Note that this picture is not representative of the subpixel structure in my screen, it's different.
What I described is the opposite of this, the green subpixels fully lightened up and the a little portion of the reds also slightly lightened.
I obviously can't discriminate the subpixels by naked eye, so only through the lupe I can see it.
I guess this isn't normal as only one color should lighten up, correct?
Is this a normal miscalibration/or oversaturation issue or is there some problem with my TV?
Before discovering this I had already noticed that the images on my display often look a bit to reddish, noticeable in peoples faces, and also had noticed that if I raise the Contrast setting very high past 95 there will be a color shift in whites becoming less red and more green or cyan... also noticed that greys look a bit red to...
I'd like to ask if this is addressable through the two point white balance controls?
I have experimented lowering the red offset until the red subpixels got lightened off in green mode with success.
But I had to lower the red offset to at least 6... which seems like a bit to much but I don't know...
After doing this I was initially pleasently surprised with the effect this simple change had on the images of my TV, grays didn't look red anymore and whites didn't color shift anymore when raising Contrast setting to max and greens and blues looked much more well saturated, peoples faces were in general more believable without the red tint.
But now there seemed to be a bit to much green in the mix so I lowered the green offset until it seemed reasonably balanced, I lowered it to 20... now there was to much blue lol.
At this point I noticed that blacks were starting to get crushed and the overall brightness of the pics was decreased and further lowering of the green and blue offsets to try to get the right (absolutelly subjective) balance just augmented those issues.
I eventually settled with a red offset of 5, green offset of 16 and blue offset of 20.
With these settings I was able to counteract the decreased brightness and eliminate the black crush just by raising gamma to "+2"...
However after this gamma adjustement I noticed that the red subpixels got slightly lightened up again (much less now) when in green RGB mode on a corresponding white area of the picture, but I didn't notice any red tint now, actually the dark areas, in some movie scenes, had an unnatural blue tint to them... but overall the picture seemed to look better fine detailed and transparent as if a dirty layer had been removed from the screen...
At this point I stopped and thought about asking for some help or guidance here at avsforum... I forgot to check if there was any color shift at white peaks again...
Unfortunatelly my setbox cannot playback any video files of mine, I can't use any test patterns to do basic callibration for my setbox it seems... unless I try to hack it's network settings to stream a video from my PC into it but that's too much hassle lol.
But anyway, I'd like to have some expert explanation or opinion or advice about my issue here with the green RGB mode and the best way to eliminate the red omnipresent glow, or at least an explanation/interpretation of what this might mean.
Any input will be greatly apprecciated!
Apologise for wall of text.