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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Blue color shift, Apple Color

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David Cho

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This footage was shot on Build 21.4.1 around noon at 5600K, 320 ISO, 4.5K WS. Redspace gamma, redspace color, Mysterium non-upgraded sensor.

I am using the FCP r3d native workflow, transcoding to r3d native prores. I downloaded the REDCODE_Color_v4_0_beta_2 framework. When I have log and transferred my footage, edit in FCP, and export this out of FCP, I see correct warm tones in my image. However, when I send to Color, and don't even touch any of the tabs or change anything, I see an addition of cool tones immediately. Here are the pictures below. The warm image is straight out of FCP, the cooler image went through Apple Color.


FCP
4553546911_05b1d79081_o.png



Apple Color v4.0 beta 2
4553547137_86f566bbda_o.png


Thanks!
 
wow, not try yet the 4.0 but this not seems a blue shift it´s more a White Balance interpretation. Go to the Red tab and check ºK.

best,
Vico.
 
Thanks for the reply Vico. The degrees Kelvin is at 5600K in Apple Color RED tab. This was shot around noon on a sunny cloudless day.
 
What version of the QuickTime codec are you using?
 
Glup!, I live fighting with gamma shift during last years but never see something like this with the previous build (color). And with 21.1.4 in camera too. Sorry.

Try re-White balance... (much work)
 
The same color temperature numbers will produce different images from the older color science to the new one. An effect of the new color science being more accurate is that it the WB numbers are also now more accurate vs the old.
 
Nick Shaw said:
What version of the QuickTime codec are you using?
Click to expand...

Hey Nick,

I'm using v3.9. Maybe I should try upgrading to Beta REDCODE QT Codec v4.1 and see if that helps? I'll try it tomorrow morning and get back to you guys with the results.
 
Deanan said:
The same color temperature numbers will produce different images from the older color science to the new one. An effect of the new color science being more accurate is that it the WB numbers are also now more accurate vs the old.
Click to expand...

Deanan,

Yes, that makes quite a lot of sense. But there couldn't possibly be that much of a difference in color accuracy between the two images? There is almost a 2000 degree Kelvin difference between the two images.
 
Well, you can have significantly more than 5.600 Kelvin at noon depending on where you are shooting…
 
Funnily enough the 5600˚K figure comes specifically from a measurement of noon light during mid-summer in Washington DC!! So expect lots of variance from this measurement at noon depending on your location, time of year, weather conditions etc...
 
David Cho said:
There is almost a 2000 degree Kelvin difference between the two images.
Click to expand...

Yes. There can be. The NCS is the most accurate white balance I have seen in any system.

56k is a very rough guide. It's still a good idea to white balance on every set- up as you will find that most things fall around (but not right on) 56K.

You can use the Autobalance feature in Color for a start and then adjust accordingly from there.

David
 
Thanks everyone, you've convinced me!
 
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