Custom white balance - how to tell what it actually is

[billium99]

HI - 5D newb here.

I'm shooting in RAW and I want to confirm/determine what my actual custom white balance temperature is set to on my 5D MK III when I take a sample with my light disc and use it to customize white balance.

The thing is, I have photos I'm needing to take in a procession, moving from light source to light source, and auto wb isn't cutting it. What I want to do instead, is match the temperature on the light sources in two of the locations to the original light source, so the shots can be shot "live" with custom white balance that works all the way through.

But when I set it to custom, while it looks great in-camera, I'm not seeing anywhere in the camera that will tell me the actual WB temperature that was detected and compensated for.

Any suggestions?

Thank you

Bill

[Skirball]

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@billium99 wrote:

HI - 5D newb here.

I'm shooting in RAW and I want to confirm/determine what my actual custom white balance temperature is set to on my 5D MK III when I take a sample with my light disc and use it to customize white balance.

But when I set it to custom, while it looks great in-camera, I'm not seeing anywhere in the camera that will tell me the actual WB temperature that was detected and compensated for.

Any suggestions?

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I never use Custom WB, because I shoot RAW, but don't you put in the exact temperture?   Isn't that what Custom WB does?  If so, I'm not sure I understand your problem.

Beside the point, if you're shooting RAW, why not just do it in post?  Choose a WB that is close to what you want, and keep it for the entire shoot (doesn't really matter).  In post, pick a sample picture, choose your WB, and then just set all the photos to that WB.  In Lightroom it takes two seconds, presumably any other decent PP software would be the same.  Unless you're shooting under CFLs they should all come out the same.

[billium99]

Thanks Skirball - my problem is that I can never achieve the realistic color I seem to get very easily using custom white balance in-camera.

And yes, you can manually set the temperature, or you can take a photo with a light disc and tell the camera to use that image as the basis for white balance. This is also technically a custom WB setting. THAT's the value that I can't seem to get downstream, and my guessing at the right temperature in post processing has been a frustrating, futile effort.

Thanks

Bill

[ScottyP]

In addition to the kelvin temp (blue v. Yellow) there is also the green v. Magenta axis (or slider).

Right?

[Skirball]

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@billium99 wrote:

Thanks Skirball - my problem is that I can never achieve the realistic color I seem to get very easily using custom white balance in-camera.

And yes, you can manually set the temperature, or you can take a photo with a light disc and tell the camera to use that image as the basis for white balance. This is also technically a custom WB setting. THAT's the value that I can't seem to get downstream, and my guessing at the right temperature in post processing has been a frustrating, futile effort.

Thanks

Bill

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I'm assuming by light disc you mean a white card (or better, gray card)?

I thought (guessing here) that when scrolling through the histograms in camera that it will tell you the temperature you shot at.  But I don't think it tells the tint (magenta).  However, any good post processing software will do it for you.  You can simply copy the settings of the photo you like and it'll apply it to any others.  Or just look at the values of the temperture and tint. 

Although, as I reread your first post, I'm not sure that's what you're looking for.  If you're trying to balance what is "white" under different light sources then you don't want the same temp and tint settings.

[billium99]

I should have specified - this is RAW video.

And I'm moving from scene to scene in one take.

[billium99]

And I was thinking if I can read the temperature that the camera is reading, and compare readings in different rooms, I would stand a chance at being able to make adjustments. But otherwise it seems like there are $1000 color temp meters.

I have seen raw software that captured in-camera temp readings, and you can read them there, but that's a long process to go through to get a numeric value for color temp.

It sounds like Canon doesn't reveal this, in-camera, unless I'm mistaken.

Thanks for your time

Bill

[TCampbell]

White balance is all about the color temperature of the light source. If you move to new lighting, then the light source changed and you have to re-sample the light for new white balance.

I don't like the white balance caps ... I MUCH prefer a real gray card. Reflected light sources can taint the accuracy when using cap type white balance disk, but that can't happen if you use a gray card.

I would use a gray card, pop it into the scene each time the lighting changes, and pop it out for your photography. Now you have real neutral gray sources captured so you can accurately adjust white balance in post and be bang-on accurate every time.

[Skirball]

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@billium99 wrote:

I should have specified - this is RAW video.

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Ah, yes.  I knew something didn't seem right.

Sorry, I have zero experience with RAW video.  But, wouldn't RAW video still allow you to make such adjustments in post without any degredation of quality?  I'm guessing that's the point of RAW video.  So, with decent software I'd guess that you could do something similar as you would in Photoshop.

But again, if I'm reading your post right, you want to match color under different light sources.  Not sure if they have a 'match color' option for video, but I'd guess that trying to blend scenes is a pretty common thing for video.

[TCampbell]

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@Skirball wrote:

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@billium99 wrote:

I should have specified - this is RAW video.

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Ah, yes.  I knew something didn't seem right.

Sorry, I have zero experience with RAW video.  But, wouldn't RAW video still allow you to make such adjustments in post without any degredation of quality?  I'm guessing that's the point of RAW video.  So, with decent software I'd guess that you could do something similar as you would in Photoshop.

But again, if I'm reading your post right, you want to match color under different light sources.  Not sure if they have a 'match color' option for video, but I'd guess that trying to blend scenes is a pretty common thing for video.

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The video editing software will let you adjust the white balance in video -- just as you can with still photographs.