Re: PESO - NorCal First Pic

[Paul Stenquist]

I'm not surprised. I rarely do any color adjustment, and I frequently 
shoot AWB. However, last week I did some shots in an exhibition hall 
with what appeared to be mercury vapor lighting in the ceiling. In some 
areas there was some tungsten light at floor level as well. I set white 
balance manually for some shots and used AWB for others. The results 
were comparable, but I wasn't happy with the color on some of the 
shots. I was able to make adjustments with the converter's "calibrate" 
sliders to my satisfaction. Whether or not the colors were "real" 
wasn't important in this case.
Paul
On Mar 11, 2005, at 6:39 AM, Herb Chong wrote:

you clipped off John's quote. anyway, straight AWB conversion with 
default Photoshop CS settings, except for possibly exposure 
compensation, of the color calibration charts taken in daylight with 
direct sun on the chart, gives extremely accurate color. delta E 
average around 3.8 and a sigma of 4.6. these results are well above 
average for DSLRs. Photo Laboratory gives delta E around 5.6 and sigma 
of 7. these are about average results for a good camera. these are 
from converting the same image files with the two programs and using 
AWB with possible exposure compensation and no other adjustment. 
making adjustments improves some things and makes others worse.

Herb....
----- Original Message ----- From: "Paul Stenquist" 
<[EMAIL PROTECTED]>
To: <pentax-discuss@pdml.net>
Sent: Friday, March 11, 2005 6:07 AM
Subject: Re: PESO - NorCal First Pic


I was a little confused by John's assertion below. In the PSCS Raw 
Converter one need only go to "calibrate," and the red hue and 
saturation can be controlled independently of the other colors before 
conversion. I can't think of a single attribute that can't be dialed 
in during conversion in PSCS. About the only thing I ever do post 
conversion is a bit of shadow/highlight control.
Paul