WHITE Reference comparison

                 Lab                CIEDE2000
Reference data   93.99/-0.50/-1.43  0.00 (as reference)

Dtp41a-xrite     94.03/-0.47/-1.44  0.04
Dtp41b-xrite     93.95/-0.51/-1.40  0.04
Dtp41c-xrite     94.04/-0.49/-1.42  0.04
Dtp41d-xrite     94.03/-0.48/-1.42  0.04

Dtp41a-xrga      94.02/-0.58/-1.56  0.17
Dtp41b-xrga      93.94/-0.62/-1.52  0.19
Dtp41c-xrga      94.04/-0.60/-1.54  0.18
Dtp41d-xrga      94.03/-0.59/-1.54  0.17

938-xrga         93.58/-0.62/-1.18  0.39
938-xrite        93.58/-0.52/-1.06  0.43
938-cp154        93.65/-0.53/-1.07  0.40 

I1pro-xrga       93.87/-0.72/-1.35  0.33
I1pro-xrite      93.88/-0.61/-1.24  0.25
I1pro-cp154      93.99/-0.75/-1.37  0.36 == -GretagMacbeth

Notes:
1) Reference data: calibration strip white reference from x-rite.
2) -cp154: data measured with Colorport 1.5.4
3) -cp20:  unspecified data were measured with ColorPort 2.0
   -xrga:  output with option xrga
   -xrite: output with option x-rite
4) All 4 dtp41s were married with the same reference data
5) Reference strip was certified on 05-Jun-2010.

Comparing an aged cal_strip with a new cal_strip

--- Aged cal_strip       --- New cal_strip
It is not surprising to observe that ΔE2000 difference for the White Reference between the aged and new calibration strips is higher than 2.

How to examine a dtp41's Calibration Strip?

Required software and accessories:
a)  Install ColorPort. The latest version is 2.0.5 , can be downloaded [ here ].
b) You need a software tool that can compare spectrum data, e.g. PatchTool from babelColor
c) Though not essential, preferably to have a alternative spectrometer such as i1pro.

Step 1: Install ColorPort

Step 2: Create a strip definition template for reading the calibration strip.
[ download  ]  025.DTP41_cal-for_calibration_strip.xml
                     DTP41_calibration-strip.tab
For windows xp3, the file 025.DTP41_cal-for_calibration_strip.xml is to be copied to the installed directory C:\Program Files\X-rite\ColorPort 2.0\Resources\configurations\PatchTemplate.

Whereas DTP41_calibration-strip.tab is to be copied to the following  folder:
C:\Documents and Settings\login_user_name\My Documents\ColorPort_Resources\custom\rgb
where ColorPort_Resources\custom\rgb is in My documents folder.

Step3: Start up ColorPort and create the custom calibration target

Now select the Measurement device and Patch Set as shown. If they are unavailable for selection, check that the 2 downloaded files are setup correctly. Next, select A4 size and proceed to create a template for reading in the strip. Save the target with the default name and by default it will be saved in tiff format.

Step 4: Reading the Calibration Strip
Click on the measurement tab, select the saved target and connect to dtp41.
Calibrate the instrument as per usual.
After calibration, feed the calibration strip again and press the button on the dtp41 to read the strip data.
Saved  the data in either in cgats or pm5, both formats can be read by PatchTool.

Repeat  the above if you want to read the strip data with i1pro. Select Patch mode ....

Step 5: Proceed to compare the collected strip data with PatchTool.
            Comparing an aged cal_strip with a new cal_strip