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CMYK issue: Krita or Cyan
#11
sorry final note
You don't believe that 4 compare tools showing basically the same result can be right.

https://www.textcompare.org/image/  is especially effective as it shows the VERY different images

I can add that : windows, gimp , krita, all display CMYK jpg appearing identical to CMYK tiff. Good enough.
Cyan doesnt show anything since it closes down.

the mentioned
textcompare tool displays more or less the actual aspect of the photos, and they are very different.

My take is simple: Gimp performs a "declared" conversion to gimp srgb, while Krita does a conversion, but
it "respects" the icc tag. Only apparently. So it seems to be working on CMYK converted files, but it absolutely is not.
Both Gimp and krita work on srgb color files. Which obviously appear and are identical.

At my age I can bet everything that CMYK converted jpg and tif files are almost totally different.
Which is the point.

So I hope some expert can suggest other compare tools to test and reach a final verdict.
Or other similar ways. But the test/s must be absolutely, fully dependable, operating at actual pixels level.

So, not really everything, but 20.000 Euros against nothing. I'll  keep my word, or bet, for sure.

Maybe it doesnt help my issue, but at least at my age perhaps I am still "awake" (can't find a word).
thanks for your help, also future, and for organizing the test/s, really


enri 
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#12
Well it is a shame that you do not believe me.

Why do you not believe your own eyes ?

From one of those comparison sites you use, one that gives only 82 % similarity. They also give their difference map.

Now if you stack the images up and choose a point, can you see any difference between jpeg and tiff.  There might be some off colour compression artefacts if you look but nothing that is going to make a difference to a print.

   

Best of luck with your search. Edit -- and do not play the older and wiser card. I am probably older than you.
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#13
I am 80 in days
pity, I really wanted to clarify this thing. 
obviously I am pretty sure , say 99.8 % otherwise nonsense a bet.

I dont know about yr attachments.

"my" sites show differences not similarities
enclosed a screenshot for the shoes photo, from img2go
i created a screenshot very very clear from textcompare, but its over 2MB...

I would like to get a final verdict. Ok I am really pretty sure , but I have other 
issues with this work and anyway I am no expert so apart from those compare tools
I can't find much more

Bet for me could be on, but bet or not I don't want to force you for sure 
oh well, I got the final screenshot from textcompare, which might give an idea, even if
not quite as the other screenshot

lets see if i can send both

strange but i am unable to send

trying again


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