i1Profiler sets the patch size for the iSis2XL at 6mm x 6mm. I assume increasing the width of the patch size would give one a better averaging. but, would increasing the height make any difference?
And, if one were to measure targets more than once for better results would there be any benefit of reading the targets in reverse order and backwards. If so, is there a way to print the reference bar on the bottom of the test chart as well. I suppose the patch set order can be appropriately reordered using PatchTool.
While this is an old post, it aligns with something I'm currently finishing work on. And that includes printing i1isis compatible charts with registration bars on the top and bottom so the charts can be read in reverse.
However, the project has larger goals.
1. printing sets of reference colors along the edges of each sheet which are used to detect significant changes in printer inking during multiple page chart printing. I've done this because some printers, particularly the Canon 9500 II, and the Pro1000, have significant shifts between the first page and subsequent pages.
2. Combining different patch targets along with a random RGB set so that the random RGB values can be used to test relative accuracy and performance of profiles. To eliminate these variables and provide repeatable evaluation of profile targets with different printers, the the combination is scrambled across all pages. So any anomalies in printing/inking are distributed. This allows comparison of different profile patch set's performance without the variation that naturally occurs in inking from one page or run, to the next.
3. The program creates a combined CGATs RGB file and associated tif target images. A reverse CGATs RGB file is also created which can be used to read in the charts in reverse order and upside down.
4. After printing using ACPU or other means of printing w/o color management, the prints are scanned with an i1isis and the results saved in CGATs format. Optionally, reverse scans can be done and saved. These, if they exist, in the next step will be automatically compared with the forward measurement files. The forward and reverse patches will also be averaged.
5. After measuring the charts with an i1isis, the program will descramble and separate each RGB patch set and save them as individual CGATs measurement files.
6. Profiles for each of the profile measurement sets can then be made with i1Profiler or Argyll. This requires a license for i1Profiler. The other steps do not require an i1Profiler license as it can be used to measure patches w/o generating profiles.
7. Now program will evaluate the profiles against the random RGB measurement set. Since the random patch set is not correlated with the patches used to create the profiles, the result is a high quality evaluation of how well the different profile patch sets work with the specific printer, settings, and paper. This makes it possible to objectively determine the sufficient, if not the best patch set for one's future needs.
8. The program can also be used simply to make a new profile by including only the desired profile patch set and random RGB patches for profile performance verification.
I have got it all working on my printers and am cleaning up the documentation and example files. Will be posting it to github within the next week or so.
Limitation:
Command line program running on 64 bit Windows 10.