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Sony XDCAM EX Pro Handhelds
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Old August 14th, 2008, 12:07 PM   #1
Join Date: Nov 2007
Location: Bristol UK
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Gamma and Matrix.

Increasing the Gamma or increasing the Matrix in picture profiles.
What are the effects of each on the picture ?
I'm just a bit confused about what they do.

EX1, Steadicam Pilot, Vegas.
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Old August 14th, 2008, 11:43 PM   #2
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Increasing the gamma-level is for example useful for pushing down values to avoid ones above 100IRE. But I'm not sure what mathematical exactly happens.
The matrix-level seems to be a saturation-control after the matrix-multiplication. If it is done in RGB-colorspace (as the main-matrix) the matrix-level could alter the weight of a linear inter(extra)polation between a grayscale- and the identity-matrix which follows the main-matrix in the signal-flow. In YUV-colorspace it would just alter a multiplier of the UV-components, but I guess it's a more efficient way to calculate the product-matrix once and use that.

Last edited by Dominik Seibold; August 15th, 2008 at 12:19 AM.
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