On 2006 May 1, at 6:13 PM, Graeme Gill wrote:
> The idea would be to have a test chart (or a program that > generates a test chart) of neutral and near neutral patches, > labelled with their delta E from ab 0,0, print them out with > (the new) cctiff through the profile in questions, and then pick > the most neutral patch by eye, and feed those numbers into > "profile" as correction factors. It's pretty easy for RGB, it's > a bit more tricky for CMYK, because there have to be two sets of > numbers, one for low K, and another for high K.
Well, I wasn't even going to /think/ of anything along those lines until waaaay down the road...but a similar thought /had/ occurred to me--that is, ``Wouldn't it be wonderful to have a test chart optimized for black-and-white prints at the expense of color prints?'' The idea was much the same as you describe: nothing but neutral and near-neutral patches, but an entire chart filled with them. Especially if it worked in an iterative manner like (I assume...) the -c flag to targen does....
I'm delighted to learn that you're a step or several ahead of me.