Datacolor User to User Support Group.

Hello folks,

I'm back!!!! I am so glad I got involved with my journey into the
world of color, because up until now I failed to realize that my
exposures were slightly underexposed for the color images I've
recently started working up to print in color. These are images I made
before getting PFP to work in color, and could have had the slight
underexposure contribute to the color cast I was getting in the
resulting prints. Also I had failed to set all the Adobe Camera Raw
settings to zero before running the Rags Adobe Camera Raw calibration
procedure on the image from the camera. This has also enabled me to
really determine the correct ISO speed to set on my light meter. The
ISO speed is set in stone on the D70 to its lowest of ISO 200. I
rarely use the in camera meter to determine exposure, but a
combination of incident readings and spot readings to see where the
separate values fall on the exposure scale from black to white or in
this case where the colors relate to on that scale. Today I went out
in the bright sunlight and made some working exposures of the Macbeth
Color Checker and determined the correct setting for the meters was
ISO 64. This yielded the proper reading for the values (127,127,127)
of the gray square that is fourth on the row with the whitest square
on the left. The pictures I've taken since starting to learn color
required additional exposure in working up in Photoshop and now I know
why. When I work up images for BW printing, color is not much of my
concern at the time. Now I am looking at color and BW with a different
mindset; and I like it. I actually feel that now I'm learning how to
be more creative with a firm foundation this is giving me. Thanks for
the answers to my questions and the encouragement.

Your friend in Photography,

Johnny

--- In colorvision_group@yahoogroups.com, "Johnny Eades" <jeades1@...>
wrote:
> When I work up images for BW printing, color is not much of my
> concern at the time. Now I am looking at color and BW with a different
> mindset; and I like it. I actually feel that now I'm learning how to
> be more creative with a firm foundation this is giving me. Thanks for
> the answers to my questions and the encouragement.
> 
> Your friend in Photography,
> 
> Johnny
>

There are some other really strange and subtle things which happen
with color that don't happen with B&W like the "Hunt Effect" where the
percieved "colorfulness" of an object increases with luminance.  Its a
strange strange world.  I'm poised to drop some money on a serious
color theory book.  The new profiles are accurate enough that the
other effects are starting to be visible.