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Originally Posted by jvincent /forum/post/15532717
Here's a classic example of people interpreting the question differently.
I was going to answer that you want to look for a crossed ramps pattern to see the effects of dithering across the entire greyscale.
To the OP, what exactly are you looking for?
Originally Posted by jvincent /forum/post/15535613
OK, so there are a few pieces to what you have described.
The first is the algorithm that the panel uses specifically for low intensity signals. My panel has 3 of them and I prefer setting "3", which I believe is the error diffusion algorithm. This is best set after setting contrast/brightness.
In terms of how to set those if you use the various calbration DVDs or BluRay there are patterns that include several low percent stimulus bars (1%, 2%, etc) that you use to set your brightness. The idea here is to be able not see black (0%) and see 1% and up.
The second thing you mention is what I was referring to with the crossed ramps pattern. As you vary contrast/brightness/gamma (and a whole bunch of other controls) you will often see very different behaviours in a crossed ramp pattern. Coloured banding is the most noticeable effect.
On my particular plasma I can see fairly dramatic changes by adjusting the contrast and/or brightness by only a couple of clicks.
This is why whenever I think I am "done" I always go back to that pattern to check for a uniform ramp and make small adjustments as needed.