Originally Posted by davehancock
I am slightly skeptical about using gain/bias controls to get rid of the green blob. If these are color non-uniformities adjusting gain/bias will not make those non-uniformities go away. What they may do, is to throw the gray scale so far away from a standard picture (D65 - 6500K) that the eye may not notice subtle shades of green.
I wish (well, not really) I had access to a SXRD set with the green blob issue so I could make some specific measurements on the impact of these adjustments - but I don't.
Dave:EDIT: I was away for awhile in the middle of this and didn't see you'd already clarified that your concern was about non-uniform issues.
I believe the 'green haze' issue I've been trying to resolve is different than the 'green blob' others have discussed. I understood the 'green blob' to show up against a uniform (single color & intensity) display as a localized area of green tint. What I've been experiencing has been a green tinge showing up against particular colors/textures primarly in low light conditions and will occur anywhere on the display these conditions exist. Thus, I tend to feel this is oriented to color decoding, not the physical light engine.
Since I do not have any tools with which to measure the color temperature of my display, I have to go strictly by eye. And by eye, my blacks, grey scale, and whites look "right" to me. Men's faces with stubble, shadowed areas and low lit backgrounds (like biege walls) and a few other situations seemed to have a green cast to them, so, I've reduced the green bias and significantly reduced the problem as I percieve it.
In bright, well lit situations, I feel my display looks very natural and I'm pleased with the colors. While this may be the "Steaming Rat" approach, it has resulted in my being happier with my SXRD, cancelling a service call I'd scheduled, and, dismissing thoughts of returning the set. If others can increase their satisfaction with and enjoyment of the set by doing similar adjustments they should.
I would be interested in seeing what it looked like properly adjusted by a knowledgable technician with proper equipment, but, probably not enough so as to hire someone to do so.
PS: for those looking for test patterns you can find quite a few here:http://www.w6rz.net/