RAW vs White balance

Started Nov 20, 2006 | Discussions thread
distudio Veteran Member • Posts: 3,913
Re: I took 15 pictures...

CurtisR wrote:

When I was perusing the presentation docs for the readout chip in
the K10D, it had a programmable per-pixel gain adjustment for the
A/D converter that is designed to be used for just this sort of
thing. If memory serves me correct, the thing can do a very crude
tone curve for each color channel at readout time, in analog.
Whether or not Pentax uses this, or does the WB while the data is
still 22 bits, it will still show up exactly like this in the raw
file (as the raw file is a reduced bit-depth version of the data
from the A/D, and the reason for bothering with the extra bits is
to prevent quantization artifacts for doing WB and/or tone curves.)

I must admit I didn't look at the links presented as I'm really not bothered either way, I always pre-set WB when shooting RAW even if crudely. The A/D converter and pre-processor used in the K10D had a 16 point gamma pre-curve adjustment capability I believe. The inference that the data is pre-adjusted in K10D RAW files is what I was alluding to, whether it's the case (due to rudimentary channel gain adjustments) in my *ist D RAW files I have no idea. I for one will still be pre-setting WB when shooting RAW using a K10D regardless.

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Rob

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