Re: RPP raw photo processor 64
Re: RPP raw photo processor 64
- Subject: Re: RPP raw photo processor 64
- From: Henry Davis <email@hidden>
- Date: Wed, 05 Jun 2013 15:53:51 -0400
Andrew - I'm just catching up on this thread and have found it
interesting. Your response to Ben about white balance on the beach at
sunset causes me to ask if there's some "native reference" or starting
point for white balance. What happens when a white balance is made?
I know what it attempts to do but I don't understand how it goes about
it. Is there a null white balance or table of some sort or is there a
common one assumed such as daylight and the new balance adjusts that?
You're right that the cast would get screwed up if white balance is
applied to the beach scene. Prints made from color neg film were all
over the place with this kind of scene but some were actually pretty
darn good. Was it strictly a difference in the creativity of the
photographer and print maker or was there a technical approach that
could be repeated with accuracy?
This business about the illuminant must be central to colorimetric
issues and it would be interesting to know more about it. It seems to
me that when filters/sensors are designed there must be assumptions
made that characterize the incoming light and this can't be gotten
around when trying for colorimetric matches.
I believe it would take a spectral approach for colorimetric matching
but it wouldn't be possible to make a print that verified it. This
would only be verifiable by the numbers - not visually. Well, that's
what I believe anyhow.
Ben - I read your statement differently I guess, and so my answer
would be: the camera imposes an inherent error. The colorimetric
problem starts there, in the camera. I don't know if a sensor or
combination of filters can be made that would make a colorimetric
match possible. On the other hand, they sometimes do a pretty good
job of matching paint at the paint store.
Henry
Message: 7
Date: Sun, 02 Jun 2013 10:29:24 -0600
From: Andrew Rodney <email@hidden>
To: "email@hidden List"
<email@hidden>
Subject: Re: RPP raw photo processor 64
Message-ID: <email@hidden>
Content-Type: text/plain; charset=us-ascii
<Snip>
Ben:
Improper white balance and exposure are colorimetric failures
Andrew:
Well it certainly isn't a recommend photographic workflow to
improperly white balance and improperly expose! If I white balance a
scene of a model on the beach at sunset, is that colorimetric
failures? It would certainly produce an image that doesn't look
anything like the original scene.
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden