Finally got some time to play about with my HS20 . This is a bit late buit might be useful to some. This is 1:1 pixel mapped to an HTPC (forget the res but its the weird 1366 one at 56Hz) which is functioning in with RGB black and white point settings rather than 16-235 which would be preferable but it shouldn't matter with regard to examining display gamma in this case). gamma 3 setting out the box looks to be around 2.2 (with some non-linearity in the RGB channels) ideally without being able to do further grayscale calibration this would be the one to plump for when watching video material. The other two (gamma1 and gamma2) appear to be 1.8 and 2.0 approx) Obviously this may vary from unit to unit but there you go.