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white balance, DNG after B&W pre JPG


Marquinius

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I've been looking through some threads, but cannot find anything on this phenomenon. If somebody can point me to the right thread, that's an answer as well!

 

First: I never shoot "in camera B&W", but I'm always trying to figure out what's happening anyway. As it is lousy weather, I have some time to tinker ..

 

I got curious, because in a blog somebody stated that when you shoot in B&W although you see the preview in B&W, the DNG is still in color. That figures. But it could help me visualize B&W while shooting, without the actual colordata getting lost. So far, so good.

 

So I took two shots, one color and one B&W, both DNG+jpg-basic, auto white balance, same light, same spot, five seconds apart.

 

The jpg's were OK as in "1 color, 1 B&W". (I only use them so I can check if my P-5000 actually downloaded them from my SD-card), but the DNG's were different. The one shot "in color" was very warm, while the one that was "behind" the B&W was cooler. The last one checked best with what I was seeing at that moment. I'll have to do this again with a fixed white balance, as I'm aware that auto WB can really jump from high to low.

 

But still: anybody noticed this or have thoughts on it? Is it still the same auto WB doing its tricks, or does the DNG really differ because of some in camera thing?

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If you "corrected" both DNGs to the same WBalance they were then the same ?

 

The wacky Auto balance is only an issue in jpeg especially as you can batch change in C1 and I think this is unrelated to B/W although I wonder if the setting affects the embedded DNG Jpeg (ie is this B/W or still colour and displayed as B/W) ?

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From time to time, I shoot in B&W mode with my M8. Today, I also figured out that these B&W DNG pictures came up in colour using Capture One LE. However the DNG thumbs looked B&W on the desk of my PowerBook running MacOS10.4. Indeed there is a difference between the true and "false-B&W" color pictures.

 

Do you have any solution to opened directly in B&W the DNG pictures shoted in B&W mode ?

Does the problem come from any settings to be corrected in the system or in Capture One ?

 

Thanks for your help

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