RAW vs White balance

Started Nov 20, 2006 | Discussions thread
GordonBGood Veteran Member • Posts: 6,308
Re: Similar with XT...

As follows:

tapir wrote:

GordonBGood wrote:

tapir wrote:

If K10D along with *istD also defeats the reason and purpose of RAW
I'll be very concerned and dissapointed especially given poor JPEG
showing. I'm shooting RAW almost exclusively. Partial reason is
ability to adjust WB in a most undestructive manner.

Alec, if you think about it and just want a fixed gain between
channels for the D's and K110/100D, just shoot with AWB or with
Sunny preset, which will give you fixed gain ratios that are more
or less as one would get from Canon. However, if you are in an
extreme WB situation, Pentax have given you the option of choosing
a preset WB or Manual WB that more closely matches the scene WB,
and correspondingly adjusts gain ratios to give you a little more
clipping in some colour channels. This is an advantage, not a
disadvantage.

Gordon, what you say makes a lot of sense. But what happens if I
didn't correctly assess the light situation and have chosen a wrong
preset or wrong non-gray/white card? With Pentax approach I may
wind up with incorrectly gained and clipped channel. Exactly the
thing to avoid and reason to use RAW (provided it WB-blind in Canon
sense) under complex light situation.

Alec, if you aren't sure how to asses whether a scene is "somewhat bluish" as in shady/cloudy, or "somewhat warmish" as in incandescent/firelight/candlelight, then just use AWB or Sunny or Flash presets (as being in the middle) and be no worse than if using a camera (ie Canon) that doesn't do this relative gain tweak. As to using coloured WB cards with Manual WB or incorrect presets to trick the camera into extending the headroom in some channels, one would have to educate themselves on how to use it effectively for particular shooting situations. I've provided the tools in the Java DNG_Analyser or the PEF_Analyser to see for yourself what particular settings do; the risk of doing it is up to you.

Again, note that the K10D appears not to do relative channel gain adjustments as do the former models.

Regards, GordonBGood

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