Film-Tech Forum ARCHIVE: Color channels not aligned during projection

This is topic Color channels not aligned during projection in forum Digital Cinema Forum at Film-Tech Forum ARCHIVE.

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Posted by Eugene Lehnert (Member # 7066) on 03-15-2013, 03:31 PM:

Hello-

I have a Barco DP90 projecting in the XYZ colorspace from a Dolby DSS200 server. The channels seems to be slightly misaligned. When white text on appears on a black background you can see green on the left edge and red on the right edge.

Has anyone had this problem?

Thanks,

Eugene

Posted by Gavin Lewarne (Member # 5397) on 03-15-2013, 04:16 PM:

sound like you need to get a service tech out to adjust the convergence in the projector.

Posted by Eugene Lehnert (Member # 7066) on 03-15-2013, 04:41 PM:

This does not happen in other color spaces though. This only happens in XYZ and not Rec709 or P3. Do different color spaces need different convergence settings?

Posted by Marco Giustini (Member # 4544) on 03-16-2013, 04:07 AM:

Not really.
Try a test pattern from the projector to check the convergence.
I cannot think of a setting in a Barco that can affect convergence to be honest. Maybe your picture is rescaled? Scaling a picture down will create some sort of artefacts, maybe you are mistaking them for convergence issue.
Select the affected macro, then using the communicator go to SCREEN and load a default 2048x1080 no crop screen file (don't save the macro). That would temporarily disable the scaling, assuming there is one set.
Scaling affects test patterns as well.