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posted by - Wednesday, 09 September 2009

test chart

For the second part of the ENG Essentials – Camera Matching Series, I will be adjusting the gamma settings on the VariCam 3700 (HPX3700) to match the gamma curves on the EX3. The HPX3700 has more gamma adjustability, so I chose to set the EX3 to a setting I liked and then adjust the HPX3700 to match. Every manufacturer has different gamma curves, so my goal is to set the two gamma curves to match as closely as possible using a DSC Labs ChromaDuMonde chart and Leader scope.

On the EX3, I set the gamma to CINE1 and black gamma to -60 in Picture Profile. After reviewing the curve on the scope, I adjusted the HPX3700 to the same exposure and tried different gamma settings, using the EX3 curve as a reference on the scope. In the HPX3700 gamma settings, I adjusted the GAMMA MODE SEL to VIDEO-REC, V-REC KNEE SLOPE to 500% and the V-REC KNEE POINT to 54% and found a very close match.

Watch my video below to see how I matched the Gamma Curves.

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