Color Temperatures have no meaning to a raw file, so Aperture probably ignores them. You might try shooting RAW+JPEG and see if they are available in the JPEG exif, You might also try something like EXIF tool on the raw file to see if sees something.
Why worry about the white balance when you are shooting raw? the whole point is to be able to defer that decision to the color-corrected monitor at home. You can always use something like a WhiBal to get a good white point.
Thanks, Keith. This makes sense. I'll also try RAW+JPEG and see.
I also realized (duh) that, in the adjustments panel, the temp value shows is pretty close to the Kelvin setting I chose in camera, so this gives me a good idea of the setting I selected. It's not quite the same, though, due, I think, to differences in color space or something.
(FYI -- I actually do have a WhiBal card and had been very happy with the results -- but I'm currently taking a course that recommends using Kelvin in-camera instead because the whibal card can pick up other casts if it's not placed *exactly* in front of the subject (which I can rarely do). Also, if I adjust WB in post using a photo of my whibal card, I'll end up with more cyan straight out of the camera, and it's more difficult to remove cyan from skin tones in post than to remove yellow. And finally, using AWB in-camera can create a misleading histogram and therefore give poor guidance on exposure. This happens if one color channel is blown. So, to make sure my exposure is right -- and to avoid the other issues above -- my instructor is suggesting setting Kelvin in camera -- or at least trying it for a while.)
Again, thanks for the reply!
To determine what Kelvin value to enter into my camera's WB field, I'm refering to Kelvin charts like this one and using trial and error to get a feel for the idiosyncracies of my particular camera: http://www.flickr.com/photos/10756195@N03/6798504656/sizes/l/in/photostream/
Side note: the D800 features something that may be of interest:
If you're an ETTR aficionado – maximizing exposure without blowing the highlights – being able to monitor not just the RGB histogram but also each invidual channel is critical. Not only does the D800/E display separate R, G and B histograms but one can also set the flashing "blinkies" to just show the blown channel(s). Nice!
Just a messenger. I don't have a D800, and I'm not entirely sure what Michael means here (or its importance). Sounds an awful lot like what I have had for a couple years with a Sony a850.
Re: cyan cast: Have you checked other WB cards? Other cameras of the same make & model?
Message was edited by: Kirby Krieger
Thanks, Kirby. My Canon 7D does something similar -- I can see 3 separate histograms for exposure. I'll have to check and see if I can change the meaning of the blinkies as you describe -- great tip!
I wanted to try working with Kelvin though since many photographers swear by it. We did an exercise in my photo class where we took a shot with AWB and then took the same shot setting WB with Kelvin, and of the 30 or so people in the class (with all kinds of cameras), almost everyone's Kelvin photo looked better.
The chart is a little broad, but the more you play with it, the better you get at estimating the right Kelvin value.
That sounds promising... but I've played with this, and I didn't find what I was looking for. Do you know how I can edit the exif data to show the Kelvin temp value?
(I've tried clicking on "edit" in the pull-down menu in the upper left corner of the metadata tab. Under "Exif," it lists a bunch of options with checkboxes. But I don't see any option that suggests it will show the Kevin temp value. There's only one option that says "White Balance," and I already have it checked -- I assume this is the field that says "Manual Temperature" when I shoot Kelvin. I do see a bunch of Nikon-specific options, but they don't help me since I have a Canon.)
Oh...I assumed that when you shoot with canon there was a field with '"canon white balance" (I use nikon white balance for showing kelvin)
I'm sorry... maybe, when you really want to view the kelvin, you can use the exiftool by Phil Harvey!?
It does not work in Aperture, but you can view all the camera settings in the original file. Maybe a bit of a cumbersome manner, but then you can see it. I've been working with it and use it sometimes when I need more information of my shooting incamera settings. (such as strobist info etc.)