I have a simple 18-patch (3 rows x 6 cols) color target defined in a CGATS file.
Using an i1i0 table I would like the use the position memory feature of CTP4 to scan dozens of samples in a row, but the measurement window closes on its own after the first (and only) page.
The CTP4 memory measurement youtube video shows a pre-defined ‘2-page’ target file, which I don’t seem to have available.
How do I define multiple pages for a target? Preferably by hand using CGATS txt files - thanks in advance!
It’s not too tough to create a multi-page target in a CGATS file - though it’s a bit odd.
First, know that most CGATS targets have column-oriented ordering and ColorThink generally expects this as well. I have a feeling that if you’ve created your own file you are aware of this already.
Second, to create multiple pages in a CGATS file add the following to the header (with a tab between the name and the value):
NumberOfStrips 3
This would be for 3 pages.
The strange thing you need to remember is that, with the file being column-ordered, the columns run through all the pages. So in your case, the first column should be 9 patches long, running through each of the 3 pages, then the next 9 patches start at the second column on the first page and run all thee way down again…
I think this was introduced by GretagMacbeth at some point but it might have been by X-Rite.
Thanks for the quick response and helpful guidance - I’ll definitely give this a try.
Alternatively it would be great to use the memory measure feature on a standard 1-page target. Maybe an option in the UI to re-measure, instead of closing after the first (and only) page is completed?
Am I right in thinking that yours is a quality control exercise? Each page represents a print from a different device and or print site? You are looking for the most automated way to farm the data?
The application is Important to understand as it will define what type and format of data you will require at the end of the exercise.
Thanks for your questions - you are correct on both counts.
We are working with some unique materials for a printing process, and trying to understand the variance in color gamut within and across runs of these prints for tolerancing.
So I have dozens of print samples that I would like to measure in an automated fashion.
