Paper profile question (black patch)

[OmerYair]

We use EyeOne to create profiles for many paper types on our lab in school (Epson 3800/4800 printers). When I print Jack Flesher's test image I have noticed that even after we use a profile we created, some of the black patches look completely black. It is especially visible on matte papers where even on the patch marked as 16 looks the same as the one marked on 2.
Is it normal?

The prints were evaluated after 24 hours of drying. The test image is the one from http://www.outbackprint.com/printinginsights/pi048/essay.html and the patches are the ones on the lower left corner.

[digitaldog]

Do you own a copy of Colorthink Pro? Because you can print the target used to build the profile and measure it. You can load the reference data and the measured data and plot the deltaE in ColorThink which gives you the expected and then measured result of the profile to see how far off those two are. Its a useful diagnostic as a start evaluating the profiles.

That said, it is completely possible that the print behavior is very non linear and without some means to linearize the data, this is the best you’ll get.

[terrywyse]

You mentioned matte papers....are you using relative colorimetric or perceptual rendering intent? Use perceptual and see what you get. If you're using relative, at least make sure you've got black point compensation enabled, assuming you have that option in whatever application you're using to print from.

Terry

[Sven W]

The L value for matte papers can be as high as 18-22, for maximum black. All other black patches with a lower value on the testimage
will look the same.
On some glossy paper, you can achieve a L value around 3-4. Then you have separation on a whole wedge.

/Sven