John Camp
Well-known
I think this has been explained a couple of times here, but the problem with the magenta is that different materials reflect varying amounts of IR -- so you don't have a consistent amount of IR coming in all over the frame. Thus, you may have two materials sitting next to each other, say a black leather coat and a black Rayon sweater, that appear to the human eye to be the same color, but the Rayon reflects much more IR and thus turns up in the photo as magenta-toned, while the leather jacket remains black. This can't be fixed with a profile because a profile takes colors down across the entire file -- essentially eliminates a certain amount of magenta -- and therefore, other colors shift. A false-magenta jacket may become black, but an orange may then shift to yellow. An IR cut filter doesn't eliminate the same amount of IR across the entire sensor -- it eliminates more IR from sources of heavy IR, like the Rayon sweater. So, in effect, the filter is selective, and the resulting file can then be tuned to appear (in color) as it does to the human eye.
JC
JC
kbg32
neo-romanticist
I bet Fred Miranda will come up with an action set to fix the magenta problem. If not him, there certainly will be a third party software developer coming up with a CS2 plugin.