Re: Generating X-Rite DNG camera profiles for LR. Did I miss something?
Re: Generating X-Rite DNG camera profiles for LR. Did I miss something?
- Subject: Re: Generating X-Rite DNG camera profiles for LR. Did I miss something?
- From: Ben Goren <email@hidden>
- Date: Wed, 08 May 2013 10:13:34 -0700
On May 8, 2013, at 9:59 AM, Paul Schilliger <email@hidden> wrote:
> Here are my first impressions, tell me please if you think that I must have missed some important step on the way, or if that's simply the way it is.
You nailed it.
You can, if you like, use Adobe's DNG Profile Editor to create another DNG Profile that uses the color tables of your new profile but with a hand-drawn tone curve that re-linearizes the curve. Your best bet is to use Apple's Digital Color Meter to check known samples, and use the fewest control points you can...if I remember right, three is about the right number for best results. Start with midtones and then refine highlights and shadows. Too many points and you'll introduce nonlinear discontinuities; much better to live with a less-than-perfect fit.
You've also got to set a linear ``curve'' in ACR, and there might be some other things you need to do (apply ACR adjustments in DNG Profile Editor?).
As for white balance...crop the image so you just see the entire ColorChecker, including the ``creative'' half. Crank the saturation as high as it'll go and fiddle with the white balance knobs until it looks as close to correct as you can get it, and then return saturation to the neutral position. The click method will get you in the ballpark, but no amount of clicking will get it perfect. This won't, either, but it's as good as you're going to get with Adobe tools.
Then adjust exposure until the N5 patch has R/G/B values as close to 118/118/188 as you can get...and then re-adjust white balance and keep looping back and forth between the two until you reach the point of diminishing returns.
Obviously, this all needs to be done before you build your DNG profile....
Cheers,
b&
P.S. Still haven't had a chance to work on my workflow document...but it's looking good for me to get to it either tomorrow or Friday, and hopefully finish up this weekend. Maybe.... b&
P.P.S. A similar workflow as what I described above is also your best bet (that I've found) for other non-ICC-aware raw development engines, such as Canon's Digital Photo Processor / Picture Style Editor. b&
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