I'm in the process of calibrating my proofer (HP Z2100) and I've noticed that when I compare the 3D gammut of the baselin'd but uncalibrated proofer with that of the GRACoL data set, some of the GRACoL gammut is outside the proofer. It is most apparent in the yellow and orange areas. Specifically, the ridge formed by the yellow step scale is more to the left (smaller a values) in the proofer gammut and more to the right (larger a values) in the GRACoL gannut. In the proofer gammut, the yellow ridge curves to the right, so the yellow midtones have lower a values than the lights or solids. When he profile is made, the resulting GRACoL proof has magenta added to the yellow (which makes sense) and the yellows are darker (lower L) than they should be, because the resulting yellow values have slid down into that valley between the two yellow ridges in order to stay within the common gammut space.
Here are some sample numbers:
Proofer
100Y 87.54L -2.45a 104.80b
50Y 92.31L -9.17a 52.09b
GRACoL
100Y 88.94L -5.02a 93.17b
50Y 91.66L -3.87a 43.57b
Is this something that others have noticed, either with this particular proofer or with ink jets in general? Is it a problem with the paper, not allowing enough ink to push the proofer gammut up high enough to encompass the GRACoL gammut?
Here are some sample numbers:
Proofer
100Y 87.54L -2.45a 104.80b
50Y 92.31L -9.17a 52.09b
GRACoL
100Y 88.94L -5.02a 93.17b
50Y 91.66L -3.87a 43.57b
Is this something that others have noticed, either with this particular proofer or with ink jets in general? Is it a problem with the paper, not allowing enough ink to push the proofer gammut up high enough to encompass the GRACoL gammut?