Pascal de Bruijn wrote:
On Sun, Jan 10, 2010 at 3:17 PM, Pascal de Bruijn <pmjdebruijn@xxxxxxxxx> wrote:Hi, Does anybody have a spectral (.sp) file of a Kodak Graycard?I'd like to see it for comparison purposes... I just spotread two cheaper "graycards" I had lying about... Regards, Pascal de Bruijn
Here is a plot containing your graycards and some other gray reference data I have handy: a really old Graycard from Kodak (if I remember correctly) and a DGC-100 Graycard from Robin Myers (both measured with my eye-one pro and argyll 1.1 RC4 in highres mode), one patch of a Kodak/Tiffen Q13 Grayscale (averaged Spectrolino measurements), a Neutral patch from ColorChecker SG (Xrite PM Reference file) and a Neutral Munsell 4.75 Chip (measured with a Perkin-Elmer Lambda 18 (SPEX) with 1nm resolution).
Needles to say that the micnova graycard is crap while the dealextreme-graycard looks pretty good.
I guess one should take the eye-one / argyll 1.1 RC4 highres readings for λ > 740 with a pinch of salt: the steep fall-off at the red end of the spectrum seems not plausible to me.
Klaus
