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Gamma Shift and Vegas Pro

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steve wilson
Gamma Shift and Vegas Pro
on Aug 2, 2016 at 10:17:13 pm

I need a pro who is familiar with the Quick Time Gamma Shift problem. I have researched (google) for a solution. It seems the solutions are what to do before rendering the movie to MOV format. I have a different problem.

I use vegas pro to edit movies that have already been rendered using quick time -- consequently I get movies that already have the gamma shift bug in MOV format.

What I'm wondering is how to fix the gamma shift problem that is already part of the movie using Vegas Pro. It may be a color correction solution but I'm far from an expert on color. The biggest problem with the MOV videos I get is they look washed out (because of the gamma shift) and any subject matter that is white disappears in the white background.

I spent a day researching but again, most solutions are how to render the video to MOV to avoid the gamma shift in the first place, but i could not find any solutions on how to fix the gamma shift that is already present in the video using Vegas Pro.

Any thoughts, feedback or help would be appreciated.

Thanks

p.s. I know you can use quick time pro to fix the problem but that is another step that slows me down. Since I use Vegas to make edits, I'm hoping I can also fix the gamma shift using Vegas Pro. If there is a preset that fixes the washed out colors (especially whites) that may be a solution but not sure.


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John Rofrano
Re: Gamma Shift and Vegas Pro
on Aug 2, 2016 at 10:55:53 pm

Try adding Sony Levels with the Studio RGB to Computer RGB preset and that should undo the gamma shift.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com



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steve wilson
Re: Gamma Shift and Vegas Pro
on Aug 3, 2016 at 1:36:03 am

Wow - Thanks for the quick reply -- it seems promising even though I couldn't fix the problem. Maybe I need to find the right combination.

One mistake I made was not to let you know the solution when using quick time pro. Maybe there is something the same in Vegas Pro

Here is the fix using Quick Time Pro

Under the “Visual Settings" I use the Transparency drop down and select Blend from the drop down. I set the transparency level to 100%

Next I select "Straight Alpha" from the same drop down.

That's how you fix the gamma shift in quick time pro. Not sure if there is something similar in Vegas Pro or not.

Thanks


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steve wilson
Re: Gamma Shift and Vegas Pro
on Aug 3, 2016 at 3:04:33 am

Hey I got it.....I found a youtube video that was in German but visually I could see what he was doing even if I don't understand German

You were right about the Levels but instead the Preset Computer RGB to Studio RGB was what worked.

Thanks again for your help


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John Rofrano
Re: Gamma Shift and Vegas Pro
on Aug 3, 2016 at 12:07:35 pm

Sorry I got it backwards. I was doing it from memory. Glad it helped.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com



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John Rofrano
Re: Gamma Shift and Vegas Pro
on Aug 3, 2016 at 12:06:39 pm

[steve wilson] "That's how you fix the gamma shift in quick time pro. Not sure if there is something similar in Vegas Pro or not."
That fix is actually not FOR QuickTime Pro it is USING QuickTime Pro to fix the metadata in the file for ALL applications. So if you modify the file with QuickTime Pro it will be fixed for Vegas Pro too.

The caveat is that the fix you mentioned will increases CPU power required to play the file and this could causes problems with large resolution files like 4K. Otherwise it works.

~jr

http://www.johnrofrano.com
http://www.vasstsoftware.com



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