Originally Posted by Michael TLV
The THX mode gamma is based on test patterns in the 6.5% size. The larger your test patterns, the lower the gamma number becomes.
I did a run with boxes in the 20% size range ... and got 2.07 range gamma. Then for fun, I went to a 10% window size and the gamma went to 2.16 range.
The test patterns you use matter. No sense killing yourself over this gamma number. It actually is where it is supposed to be.
If I understand this post correctly, it is counter productive to calibrate the "Gamma Detail Adjustment" (IRE) on Panasonic Plasma display's to coincide with the selected gamma setting in the user menu.
You begin a calibration session with the gamma set to 2.2 in the user menu, your software shows that you have an average gamma reading around 2.1 with 10% and 20% being lower and of course 80% and 90% is lower. These numbers are not accurate because of the size of the windows used due to ABL and your "true" gamma is actually 2.2.
Therefore, adjusting your "IRE" in the "Gamma Detail Adjustment" menu so that the software is showing a flat 2.2, is incorrect and what you have actually done is set your gamma to a higher number than 2.2.
If this is correct, then assuming that I understand Michael's post, the correct procedure would be to leave the IRE settings alone with respect to gamma?