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Posted: Fri Jan 09, 2009 9:18 pm
by ggroess
Indeed it might but in the mean time have you looked at the Library curves for some fast corrections from Daylight to Tungsten?
See attached Screen shot.
There may be a better starting point for your light balance challenged images.
Greg
Posted: Sat Jan 10, 2009 6:45 pm
by mikemeister_admin
Greg,
I like all the topics you propose and your idea to work on a few "problem" picts/week. I also second the suggestion to talk about workflow and I would be particularly interested in any time saving tips in using CM.
Covering all this might take more than 4 weeks?
Gus
Posted: Sun Jan 11, 2009 12:07 am
by Alex314
Greg,
thanks for your response: I never knew there was such a library (don't hit me - ouch!!). I will certainly look at it. In the mean time: what happens to r, g, and b when you go let's say from 2500 to 6000 K?
Posted: Sun Jan 11, 2009 2:02 am
by ggroess
hmmm??? many things...let me look at some images and see if I can work up an example....
Stand by....
Greg
Posted: Sun Jan 11, 2009 10:05 am
by mikemeister_admin
You could do an experiment, however to start the ball rolling - I took these images on my first CM course to see if I could convert one to t'other - I failed of course! (and I think it is impossible to get right - am I correct Greg?).
I include the RGB channels - is it obvious which belongs to which?
I think one needs a better image with more colours and variation (perhaps a print test image) for a proper experiment.
Posted: Sun Jan 11, 2009 6:09 pm
by ggroess
Getting it right in this area can be very subjective.
I usually find that if I get parts of an image right I also get parts of it wrong. It usually comes down to acceptable compromises.
For a scene like this one, where are converting to Daylight I can usually do a better job of "getting it right" I have better visual references to work with.
When you have a daylight balance and indoor lighting it gets very muddy, very fast. Many times with "mixed" lighting you have a strong color cast that you can get rid of only to find a second color cast that is creating problems in the image. An example would be a church with stained glass windows or sodium lights with florescent in the background.
Any mixed lighting scene is a "special" challenge and can require multiple steps, masking, and even color space changes.
Bad color balance can be overcome....
http://www.curvemeister.com/forum/index.php?topic=2222.0Greg