Hi !
I am using Lightroom to process images taken with my digital back (IQ160) which is used on a tech cam.
I'm happy with this, except I am missing lens profiles, and particularly vignetting correction. So what I do is to shoot an LCC and I use the Lightroom flat-field plugin. This works fine, but is a bit cumbersome (convert IIQ raw files to DNG, then apply the plugin, get _ff.DNG files, delete the temporary DNGs, stack and then use the _ff files).
I would like to simplify this workflow, and just measure the vignetting from the LCC, figure out how many Lightroom units of vignetting correction needs to be applied and just dial that in LR. Since I always shoot the same lens with the same aperture, I think this should work fine.
Now the question is: how do I determine precisely how much vignetting correction to use ? Of course, I could try to eyeball it: take the LCC, and apply vignetting correction until it looks uniform. But that seems a bit crude. I'd like something like a cut across the (corrected) LCC to see when it really becomes flat.
Any ideas ?
I could also use Photoshop, but my skills are not good enough to know how to do that...
Thanks for your ideas !