Lumagen Internal Test Pattens vs VideoForge/Oppo
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I ran into a problem 2 weeks ago while attempting to set up/test the Lumagen in my own setup before setting up for a client. My workflow is as below:
1. VideoForge directly to display – calibrate greyscale, gamma with controls in display. I did not correct gamut as the Kuro does not have a 6 axis CMS and I started with a wide gamut so I can pull it in with the Lumagen
2. I then hooked up the Oppo BDP-93 directly to the display. I checked with the AVS HD709 test disc that confirmed that the greyscale and gamma was accurate
3. Next, I put the Lumagen directly to the display, without the Oppo in the chain, pulled out the reference test patterns on the Lumagen and checked the greyscale, gamma. As the results show, the greyscale is off compared to what the VideoForge/Oppo was showing. This indicates that the output sent out by the Lumagen are not the same as the VideoForge/Oppo. It is +green on the greyscale but similar in terms of gamma and gamut. Is this normal? I made sure that all three components were outputting YCbCr 4:2:2. I get the same results if I run the Oppo thru the Lumagen with no adjustments on the Lumagen and checking with the AVS HD709 disc, there is a +green greyscale.
4. I am aware I can calibrate that out, that’s not my concern. My concern is that the Lumagen is altering the greyscale even when it is not adjusted. I was under the impression that the Lumagen is very neutral and that the test patterns I them are reference as well. It is not so.
Attached are the reports. Has anyone else seen something like this or do I have a bad Lumagen. I have sent all these reports to Lumagen but they believe that I selected a different colour space for the Lumagen. I verified that the Lumagen was set to output 4:2:2 YCbCr. I am skeptical to install this in a customer’s home although I can calibrate out the differences. The fact that the VideoForge and the Oppo agree so closely makes me believe that the Lumagen is not really as neutral as I thought.
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