Digital Light & Color

There are channel multiplier values listed in EXIF/MakerNotes. Is that where dcraw reads them from to, then, derive Colour Temp and Tint values?

When PWP RAW uses WB=Camera WB, where does it read the value(s) from? An EXIF/MakerNotes? I can't match the values of Colour Temp and Tint with anything that I can see in the EXIF.

I noticed that as PWP RAW recalculates the preview, the Noise Reduction (if it's used) is applied twice: once for the WB and once afterward. Is that how it works? If it is, would it be possible and would it make sense to always apply the NR for the white balance (regardless if NR is actually used or...

Thank you - the large amount/level of noise reduction seem to make the WB much more consistent. All in all the actual light temperature of the flash (a build-in, compact flash) as I figured doing the test above seems to be around 6500K, this is quite different from both: the PWP RAW flash preset and...

I shot a Macbeth chart in total darkness, using flash only. When setting white balance in PWP RAW using the white balance probe on the gray patches, I can get temperatures between 5500K and 6800K, pretty much randomly depending on a click, even within the same patch (and even more heterogeneous if c...

What I meant re. the temperatures was that if a lamp had an actual colour temperature of say 5500K, but the preset WB in camera/raw for flash was higher (e.g. 6800), the resultant image will be warmer. Right? Since it is a small built-in flash unit, I thought that it was done on purpose to skew the ...

Thanks Kiril, I guess my question is: are the relatively high flash colour temperatures hard-coded in Canon WB for it's in-camera flash units, realistic - is it possible that they describe the average actual light colour or did Canon cranked them up to make the images look warmer? I have no way of m...

That was 6350K and ~6800K for Canon cameras, not 5350K.

PWP RAW uses 5500K as a flash colour temperature. One Canon camera seems to be using 5350K, while another ~6800K if WB is set manually to flash. How come? Do electronic flashes differ that much in colour, or does Canon crank it up on purpose to make the images look warmer?

I'm struggling with details in my experiments with Macbeth, and I just want to check my understanding of fundamentals of Match reference, which I thought I understood, but I'm not sure any longer. In theory, with monitor calibrated, if I take a properly exposed picture of Macbeth colour chart illumi...