Datacolor User to User Support Group.

Ok,

A1 = 4.25 0,00 0,33

B1 = 4,51 0,30 1,14

C1 = 7,50 4,43 -2,87

So you are right, the meter sees difference!

After profiling the prints look to green, i will retry with newly printed patches to see if it make any different.

Herwin Jan

On 16-jun-2007, at 20:11, David Miller wrote:

>Hi,
>
>Thanx for the quick answer!
>
>What about this question:
>?
>A1, B1 etc are measured Grey. Is this normal?
>
>On the paper they look realy black! How-come that they are measured grey, is this normal?
>

They will always "look" lighter (more gray) than the "pure" patches in the
split view; what really matters is what the L,a,b values of the measurements
are.

First of all: to "see" your measurements better, get out of the Split display,
using the popup in the lower right corner of the Target window, and switch
to Measured mode, instead. This way you'll see only the measured values in the
entire patch; less distracting and more useful than the Split mode.

Move the cursor to the different boxes, and read the values in the bottom
of the Target window. If you've calibrated the spectro; and measured correctly;
you should find that the darkest patch (smallest L value) is 1A, which is
perfect black.

Looking at your attachment, that doesn't appear to be the case; I can't
see L values for these, but using an on-screen digital meter, your 1A
measurement is lighter than 1C and 1D. So: you may not have measured those
patches correctly; maybe you overlapped the measurement tip onto the white
gaps between the patches; you might need to go back, check, and remeasure
these.

On Premium Glossy on the R1800, you should be getting very small L value for
black (around 5, maybe even a bit less). More than that isn't correctly; and
if you look at your actual target print, you should also SEE (visually) that
1A is darker (or at least, visibly as dark) as 1B through 1E. It shouldn't start
off lighter and then get darker (as your attachment looks) as you go across.

Also, make sure you've calibrated your SPECTRO correctly: on the white round
tile on the calibration base; not on the paper. (PFP 2.1 has a picture of the
spectro sitting on the calibration base to make sure this is clear).

If your L for the black patch is more than about 5; and if 1C and 1D are
actually darker (smaller L values than 1A); then something's not right in those
first couple of meausurements; either go back and remeasure them; or start
over and remeasure the entire target more carefully; using Measured mode the
entire time, so you can better see what's happening; pay attention to some of
the Lab values as you measure, those darker patches in particular; and make
sure that they're behaving correctly.

Best regards,

--
David Miller
Senior Software Developer, Digital Color Solutions
ColorVision

__._,_