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Luma over 100%. Is it ok or not?

Paolo Grisendi's picture
Last seen: 4 months 2 weeks ago
Joined: 04/21/2012 - 1:35pm



I saw a tutorial where the guy talking about color correction said that the luma value should never go over 100 (he used the Waveform monitor in FCP X)


I shot this video and applied some color correction. After this process, the luma value is way over 100%. I think it still looks ok, what do you think?


I also applied the broadcast safe plugin but it didn't do much at all..





Charles Schultz's picture
Last seen: 2 years 3 months ago
Joined: 10/25/2010 - 10:38pm

Basically the only time you truly have to worry about luma / IRA values over 100% is for broadcast television. I know you have seen infinate white backgrounds and I am sure they most are over 100%. Plus, if you think about it the white background on VM is probably over 100%.


Hope that helps,



Brian Collins's picture
Last seen: 1 month 4 weeks ago
Joined: 02/12/2013 - 9:38pm

Staying at 100% or lower is good practice and will insure that your signal looks consistant across all platforms.  Go over 100% luma and 75% chroma and TV station proc amps will force your signal into legal color space.  



Brian Collins

Atomic Pictures Inc

Birmingham, AL