You don't need much patches to create a good printer profile

[pharmacist]

OK, I will have a check. Maybe you can tell me which patches are doubles, so I can change them. Thanks for the feedback.

 

[Ink stained Fingers]

PaintShop just gives me the number of unique colors - nothing more - no value or location in an image file whatever.

But I could find a way to export the patch file data from the i1Profiler editor as a tab separated text file with the RGB values but again no location data within the patch sheet but it most likely arranged in a left-right - top - down scheme in a sequential table.

 

[pharmacist]

I think I might have found the doubles and removed them. I think these are the last 6 RGB patches (with different hues) before the near neutral patches. I replaced them with extra near neutral patches. The pink outlined boxes are the doubles I have detected.

The new target looks like now:

 

[Ink stained Fingers]

You got it - it's 192 different colors

 

[Ink stained Fingers]

@pharmasist - it works - I printed your 192 patchsheet on a 10x15 cm card and scanned it with the i1io2 robot - it works !!! - that was some great work you did to create the necessary parameter files and patch sheet.

 

[pharmacist]

@pharmasist - it works - I printed your 192 patchsheet on a 10x15 cm card and scanned it with the i1io2 robot - it works !!! - that was some great work you did to create the necessary parameter files and patch sheet.

I hope you will report back and see how this target will perform compared to a larger patch size target like 729 or even 2880 patches. If the average difference will fall under Delta-E 1, than it is practically indistiguishable compared to much larger targets. The 165 patch target was already satisfactory (thinking it has a few doubles too, making it a 159 patch target). I think it has twice the amount of patches of your 96 target. Note: GretagMacbeth original simple printer target has only 45 patches (eye-one match):

 

[Ink stained Fingers]

I expect a marginal change for the DeltaE 165 vs. 192 - value only - in the range of reading noise/variations behind the decimal point. Let me see.

 

[Ink stained Fingers]

Let me mention the DeltaE numbers of the last test - I did in this case compare the patch prints done with the 720 patch profile and the 192 patch profile - on the Netbit paper - it is 1.3. There was a problem with the prints on the Action paper - there was a defect spot in the coating on one sheet driving up the DeltaE to 3.5 making this number meaningless. We are looking to deltas of deltas - and I'm glad that numbers are consistent so far so I'm not redoing the test on the Action paper - the small patch sheet with 192 colors delivers already a very good profile consistent with the other numbers, and I'll go and use it as appropriate.

 

[pharmacist]

Nice to hear. So according to you most will be more than satisfied with this miniature 192 patch target. That would be very interesting for a fast target to try out aftermarket ink/paper combination without spilling too much paper/ink/time to get good results. Now maybe I should produce a half size A4 AKA A5 target patch sheet with around 400 patches or even a 13x18 cm fast target set (maybe 300 patches ?).

 

[Ink stained Fingers]

I appreciate the optimization of the 10x15 cm patch sheet to 192 active patches very much, but I actually don't really need much more of that with higher patch counts. You may have a look to some improvement for user doing the manual scan with the original scanning board - e.g. larger patches or or ........whatever . I just let the i1io doing the job.
A A5 patch sheet may be of help - I sometimes do multiple profiles to see if driver changes make a difference - paper selection - quality level.