Re: Profiling Digital Cameras
Re: Profiling Digital Cameras
- Subject: Re: Profiling Digital Cameras
- From: drdot <email@hidden>
- Date: Mon, 11 Mar 2002 07:02:50 -0800
>
under a specific lighting condition. If you change the condition, i.e.
>
shadow one corner
>
of the target or have one light 100 degrees kelvin cooler than another
>
you will
>
radically change the outcome. Shooting a target in anything other than
>
very carefully
>
controlled circumstances will create a profile of little value. What you
>
need is one
>
profile created under these carefully controlled circumstances, that can
>
be applied under
>
most lighting circumstances following proper linearization(gray balance)
>
of the camera
>
for each scene. One profile serves me extremely well under all lighting
>
conditions I
>
need to work under, tungsten, strobe, fluorescent and any number of grim
>
industrial
>
types. We really do need to get past this notion of a profile for each
>
scene, cause 1.
>
it does not work and 2. it is completely unnecessary.
>
>
[demime 0.98b removed an attachment of type text/x-vcard which had a name
>
of jack.vcf]
You are basically reiterating my point here. The whole list is a buzz about
this subject of Digital camera profiles. The real issue here and the issue
that I see between the lines on all of these threads is that you can't
profile a digital camera. You can profile all of the conditions that a
digital shot was shot under with that camera though. Another point being
that a profile is not always the end all answer. You still need all the
algorithms that "try" to compress or expand the color space of all those
variables into another space.
When using a digital camera all the things that are problematic with
viewing booths are piled onto the variables that all of the other devices
contend with for color reproduction. To name the ones I'm familiar with
that are the most problematic are color temperature, metamersim and mixed
lighting.
The point I've been trying to make and also seems apparent in all of these
threads is that there is not and never will be a "magic profile". Just like
there was never a magic exposure/ filter /film /film processing procedure
for every photographic situation. You can get close enough, but there is
always educated guessing involved.
A profile for a digital camera is only as good as the stability of the
conditions of witch the images were shot under. That's why a profile will
need to be made for each of all of the infinite conditions. If you could
control the conditions as in a studio you could maintain a realistic set of
profiles for those controlled studio conditions.
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.