RED Alert White Balance off on build 20 footage

[Andrae Palmer]

Thanks! This kind of data is very useful for me as we go forwards!

Graeme

You are correct Graeme there is a big difference in the color temperature of daylight. I thought 5600k would have been pretty close... I'm learning that I will have to white balance each and every time. I used the 18% gray card and got a reading of 4578 Kelvin in bright sunlight with no cloud cover. With cloud cover its around the 5600k ball park.

RED Alert v20.1.6 color temperature at 5600k:


RED Alert v20.1.6 color temperature at 4578k:


The funny thing is that I don't remember this type of cast on my older 5600k clips shot with non Build 20. More accuracy in Build 20?

[Graeme Nattress]

Much more accuracy in B20 - that was one of the goals of the project.

Graeme

[Andrae Palmer]

Much more accuracy in B20 - that was one of the goals of the project.

Graeme

Thanks for your help sir... I was surprised that the color temperature of sunlight varies so much by over a 1000 kelvins depending on the conditions outside.

[Graeme Nattress]

Daylight color temp varies wildly and is hardly ever, so it would seem, the D65 it should be. It seems to be commonly in the 4800-5000k range when I've tested it, but I'm told can get very much higher under a storm cloud, but I've not been outside to test that just yet.

Graeme

[Mark Pugh]

the old calibration thought white was around 5600k, and the new around 4800k

Graeme

guys, that would mean that the Redcine image should be the warmer one.

[Graeme Nattress]

If the real color temp of the light was around 4800k, but metadata was recorded at 5600k, then the new CS will display the image as warm. The old CS will display it as neutral because the old CS calibration thought that the real world 4800k was much nearer to 5600k.

Graeme

[Mark Pugh]

If the real color temp of the light was around 4800k, but metadata was recorded at 5600k, then the new CS will display the image as warm. The old CS will display it as neutral because the old CS calibration thought that the real world 4800k was much nearer to 5600k.

Graeme

thanks. gotcha.

[Andrae Palmer]

If the real color temp of the light was around 4800k, but metadata was recorded at 5600k, then the new CS will display the image as warm. The old CS will display it as neutral because the old CS calibration thought that the real world 4800k was much nearer to 5600k.

Graeme

This makes a lot of sense... but why was the old CS calibration so way off?

[Graeme Nattress]

Why was it off? Because it's darn hard to get it accurate :-) Take a look at Aperture and Lightroom (just because they're the stills raw converters I'm familiar with) and shoot something raw on, say, your Canon DLSR (again, just because I'm familiar with it), and measure the color temp with your temp meter. Shoot with RED One B20 and compare...

Graeme

[Andrae Palmer]

Why was it off? Because it's darn hard to get it accurate :-) Take a look at Aperture and Lightroom (just because they're the stills raw converters I'm familiar with) and shoot something raw on, say, your Canon DLSR (again, just because I'm familiar with it), and measure the color temp with your temp meter. Shoot with RED One B20 and compare...

Graeme

I wish I knew more about the technicalities of Color Science to be aware of the issues faced.