On Sep 18, 2015, at 3:47 PM, Spinnaker Photo Imaging Center <spinnakerphotoimagingcenter@dnmillerphoto.com> wrote:
Thank you Ben.
Chart would be only for my personal use……..Now, if I missed it, what do you do today?
Short version...I take a picture of a diffuse light source viewed through a spectroscope and extract RGB values from it. That plus an i1 Pro measurement of the light source and separate measurements of the transmission efficiencies of the diffraction grating and the lens gets me the camera's per-channel spectral sensitivities. Once you've got that, you can combine it with the spectrum of any illuminant and the efficiency of any lens / filter combination to predict RGB values for any known reflective spectrum. And I do so for tens of thousands of virtual samples to create a virtual chart with that many patches and use Argyll to build a profile from that. It's specific to the illuminant and lens, but then so is any profile. I'll be doing a full writeup in the hopefully-not-too-distant future.... Cheers, b&