Join Date: Aug 2006
Location: Christchurch, New Zealand
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Recently I just happened by chance to have access to a UK model and got to try out autocal. I found nice graphs, but poor results with banding type effects in the upper reaches of the ramps.
I see this also in manual calibration if you adjust controls to extremes between 10% increments. With that in mind check the values of the white balance and gamma around the troublesome areas and you might find full range adjustments here especially look for adjustments in opposite directions. I suspect the culprit is the interface between two points made worse by non linear gamma tracking in plasma designs requiring large 10% step adjustments.
I'll steal Mr Kanes words here, "Extreme caution must be exercised" when making large adjustments with detailed controls.
Sometimes you have to choose the lesser visual effective error over graphical exactness.
Masterpiece Calibration Ltd