Extron Electronics MS9200P - Manual (Page 55)

HD Player Chapter 7: Soft Edging/Display Overlap
55 Rev. 6.8
Gamma
Once the borders have been defined, the next requirement is to determine the rate of change that occurs to the light
level during the transition between the start of the overlap, to the non–overlapped part of the image. This can be
thought of as ramping the image from 0% brightness to 100% brightness.
In its simplest form, this ramp is linear (gamma value of 1.0) as illustrated above. However, the light output of a
projector does not have a linear relationship to input voltage and so a gamma correction must be applied to the
ramp to compensate.
The following diagram illustrates a gamma corrected brightness curve.
The HD Player produces two independent curves for each output mode:
1. In the YPrPb output mode there is one for Luma (Luminance) and one for Chroma (Chrominance).
2. In RGB color space the green output has its own curve, and Red/Blue share the other curve.