Datacolor User to User Support Group.

>
> Emailed you you the URl to files. Did it provide any insights what
> could be the problem?
>

Yes. (Detailed email in response, too look to reproduce here, but
I'll summarize for the group).

Measurements on Canvas are correct and consistent; no errors.
The measured BLACK on Canvas is very weak (L = 24) and this is the
reason for the loss of contrast in S3P's softproof. (It always
simulates black ink, unlike Photoshop, which has a control to
turn this off). There's no way to avoid this loss of contrast
in S3P's softproof for target prints which have weak blacks;
so for "better" softproofing, you need to use View:Proof Setup:
Custom in Photoshop and turn black ink simulation off. (Visible
contrast is then restored)

The gamut shape of the profile is squished vertically because
the black measurements are so light, but there's no avoiding
this. The measurements are the measurements (and they're correct)

Black is better in the glossy measurements you sent, but there
are still problems with the shape of the gamut.

(These were all done on an HP that doesn't have black ink and
which generates black from CMY inks only)

Problems with blues, printing: all of these measurement
produce profiles that will desaturate blues if you don't softproof
and print through the Saturation intent.

(much more detail in my private response, with half a dozen
screen captures of examples, gamut shapes, etc)

Also wondering if inks or need to clean the heads could be part
of this. Typically, profiles that produce gamut shapes which
are squashed or crushed in strange ways are a result of one or
more inks not working when the target print was made.


David Miller
Senior Software Developer, Digital Color Solutions
Datacolor