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Author Topic: specific amount of patches or as many as fits on a page?  (Read 1619 times)

smilem

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specific amount of patches or as many as fits on a page?
« on: June 05, 2018, 03:39:07 am »

Hello, so I would like to know what would be proper workflow to fit as many patches (ISO 5-4:2009 compliant or not) as fits or specific amount as i1profiler does give more gray patches of some patch count?

Given the fact that some use letter some a4 page size one amount does not fit all :(
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smilem

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Re: specific amount of patches or as many as fits on a page?
« Reply #1 on: June 05, 2018, 04:11:07 am »

i1profiler fits 34rows on a4 page while profilemaker fits 35rows.
device is isis and patch size is 0.65cmx0.65cm
Is there are file to edit to make profilemaker also fit 35 rows?
« Last Edit: June 05, 2018, 04:32:05 am by smilem »
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digitaldog

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Re: specific amount of patches or as many as fits on a page?
« Reply #2 on: June 05, 2018, 09:46:26 am »

Smaller (and more) patches isn't always the best approach to target creation!
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smilem

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Re: specific amount of patches or as many as fits on a page?
« Reply #3 on: June 05, 2018, 11:14:32 am »

Smaller (and more) patches isn't always the best approach to target creation!

Yes I know that, but i1profiler patch generator likes happy numbers (where it gives gray patches) like 453; 517.
Is there a list of all of them and explanation why?
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digitaldog

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Re: specific amount of patches or as many as fits on a page?
« Reply #4 on: June 05, 2018, 11:17:44 am »

Yes I know that, but i1profiler patch generator likes happy numbers (where it gives gray patches) like 453; 517.
That comment makes no sense to me as provided (happy numbers), care to explain colorimetrically?
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smilem

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Re: specific amount of patches or as many as fits on a page?
« Reply #5 on: June 05, 2018, 11:21:02 am »

See attached files, they illustrate what i mean.
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digitaldog

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Re: specific amount of patches or as many as fits on a page?
« Reply #6 on: June 05, 2018, 11:54:57 am »

See attached files, they illustrate what i mean.
Yes they differ, so what? Which is happier? You can add any number of patches you desire, anywhere in color space. The auto patch generation isn't necessarily ideal nor recommended!
Make your own 'happy numbers' and create patches.
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smilem

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Re: specific amount of patches or as many as fits on a page?
« Reply #7 on: June 05, 2018, 12:21:38 pm »

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digitaldog

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Re: specific amount of patches or as many as fits on a page?
« Reply #8 on: June 05, 2018, 12:31:16 pm »

Well happy number, magic number whatever you call them.
I simply call them patches. From numbers. Which you can create. There isn't anything inherently magical or happy about any of them.
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smilem

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Re: specific amount of patches or as many as fits on a page?
« Reply #9 on: June 08, 2018, 09:11:29 am »

Well that is your experience, it's interesting what others have to say too. I have found over 70 CMYK variations of targets that give more neutral patches then others. Still need to think how to analyse them. But patters are emerging.

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digitaldog

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Re: specific amount of patches or as many as fits on a page?
« Reply #10 on: June 08, 2018, 11:49:33 am »

Well that is your experience, it's interesting what others have to say too. I have found over 70 CMYK variations of targets that give more neutral patches then others. Still need to think how to analyse them. But patters are emerging.
Not all targets are created equally! In an ideal world, we'd measure all device values in a defined and large color gamut (so something close to 16.7 million device values). It would take forever and the profile size would be larger than many images. So extrapolation has to take place. Consider post optimization too! Assuming the product(s) you use support this.
Not sure what you need to analyze or how. Perhaps we'll find out what makes a patch 'happy' or 'magical' from your 'analysis'.  :D
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Doug Gray

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Re: specific amount of patches or as many as fits on a page?
« Reply #11 on: June 08, 2018, 04:15:45 pm »

Well that is your experience, it's interesting what others have to say too. I have found over 70 CMYK variations of targets that give more neutral patches then others. Still need to think how to analyse them. But patters are emerging.

For quite a while I struggled getting good neutrals on my 9800. It has some fairly rapid changes between L*85 and 90 on the b* axis in particular. I've settled on a highly concentrated group of neutrals and near neutrals in that range and just add them to a general, optimized patch set when I make profiles where those neutrals are critical.  This was really more for creating specialized images I had designed to test imager registration and quality for a QA process. They aren't visible under normal conditions.
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