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Gamma shift as Boris titles come in

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Andy Taplin
Gamma shift as Boris titles come in
on Jul 11, 2011 at 11:04:45 am

Hi All

Just had a strange issue where the gamma of the BG video goes higher as a Boris title comes in from the V1 track - and then back to normal after the fade out. You don't see it in Media 100 but only once exported to QT as either by-ref or self-contained. I'm working in the Media 100i codec for this project with 13.0.4 and OSX 10.5.8, QT 7.6.9. No time to try and resolve the problem so I did the title in AFX.

I'll do some tests this week but in the meantime does anyone know what's going on here?

Thanks

Andy Taplin
Director / Lighting Cameraman
http://www.andytaplin.co.uk


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Floh Peters
Re: Gamma shift as Boris titles come in
on Jul 11, 2011 at 11:10:24 am

That´s the joy of QuickTime. Media 100 i codec uses a different RGB colorspace than Apple codecs. So if you render something in ProRes, it looks different, at least in QuickTime player. The solution is to do a QuickTime export into the codec of your choice (not as by ref or self contained), or to stay within a single codec on your timeline.



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Andy Taplin
Re: Gamma shift as Boris titles come in
on Jul 11, 2011 at 11:17:54 am

Thanks for the quick response Floh. I have not changed the codec on the timeline - it's M100i throughout so the rendering of titles is also M100i so there shouldn't be any gamma shift when rendering the titles should there?

I did a project using M100i about a month ago and did not have this problem then - nothing's changed.

Andy Taplin
Director / Lighting Cameraman
http://www.andytaplin.co.uk


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Floh Peters
Re: Gamma shift as Boris titles come in
on Jul 11, 2011 at 11:20:19 am

yeah, I bet it render in something different. Locate the rendered file in your Rendered Media directory, and open it in QuickTime Player. Command-I to get the clips infos, and there you should see the used codec.

Make sure your render settings are correct, and try to rerender.



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Andy Taplin
Re: Gamma shift as Boris titles come in
on Jul 11, 2011 at 11:31:55 am

Just looked at the rendered media file in QT player and it's definitely Media 100i - the only thing I can think of is I rendered it lossless - not that that should make a difference?

Andy Taplin
Director / Lighting Cameraman
http://www.andytaplin.co.uk


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Floh Peters
Re: Gamma shift as Boris titles come in
on Jul 11, 2011 at 11:43:21 am

[Andy Taplin] "not that that should make a difference?"

No.

Just get over it and export via QuickTime.



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Andy Taplin
Re: Gamma shift as Boris titles come in
on Jul 11, 2011 at 11:52:31 am

OK, that works, thanks Floh.

Andy Taplin
Director / Lighting Cameraman
http://www.andytaplin.co.uk


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