[argyllcms] Re: Problem with packaging profile

Hello Nikolay,

I´ll try this one and get back.

Thank´s
Vladimir

2011/11/14 Nikolay Pokhilchenko <nikolay_po@xxxxxxx>:
> Vladimir, try to build an intermediate smoothed profile:
>
> colprof -v -al -qu -bn -r10 -D"Smoothed. Only A2B" packagingPrint
>
> You've get smoothed device behavior in A2B table of this profile.
> Then You can fakeread Your (or any other) chart by smoothed profile. As a 
> result You'll have the same (or other) chart but with smoothed data. This 
> data can help You to build the profile with more smooth black generation.
> I suppose the 390% TIL is quite high for the process You profiling. Argyll 
> says to me that 265..270% TIL is enough.
>
>
> 14 nov 2011, 17:22 (+4:00) Vladimir Gajic wrote:
>
>> Hello Alexey,
>>
>> I?ve allready tried smoothing in PO (value = 10, max). My results
>> basically stayed the same -aldough the dot gain curves looked quite
>> nice & harmonic. The major problem was the separation. It was full of
>> bumps, especially in the black channel.
>>
>> I?m quite aware that this problem can be partially solved using
>> PrintOpen -but the profiles are IMHO far from being optimal. My idea
>> behind this posting was something like "pushing the limits of argyll",
>> since the print you evaluated ist almost a common condition in the
>> packaging field.
>>
>> Thank?s for reply anyway.
>>
>> Vladimir
>>
>> 2011/11/14 Alexey Gribunin <Gribunin@xxxxxxx>:
>> > Hello Vladimir!
>> >
>> > Your printing process has very bad gradation curves. Please take a look on
>> > dot gain curves on screenshot. You will not get good results with such dot
>> > gain curves.
>> > So first of all you need to smooth it.
>> > You can do it in PrintOpen, I would suggest to use smoothing factor at 
>> > least
>> > 9. After that you can create ICC profile wherever you want.
>> > ArgyllCMS colprof also has average deviation feature -r (something like
>> > smoothing), but it cannot do such powerfull smoothing you need.
>> >
>> > Best regards,
>> > Alexey Gribunin.
>> >
>> > Vladimir Gajic wrote:
>> >>
>> >> Hello@all
>> >>
>> >> in the attachment you will find ti3-data from a packaging print I?e
>> >> tried to profile using Argyll V.1.3.5.
>> >> No matter what I did, I wasn? able to get a decent result, so maybe
>> >> on of you guys have a better idea.
>> >> The print is very inconsistent, especially the gray-axis. Anyway -this
>> >> is quite a real-life situation in packaging.
>> >>
>> >> I tried also to build a profile using other packages (e.g. PrintOpen).
>> >> The results where somehow better, but still not satisfying.
>> >> Maybe this example also could be a good test-item for Graeme?
>> >>
>> >> Some parameters needed:
>> >>
>> >> Total area coverage: 340%
>> >> The separation should be UCR (under colour removal)
>> >> The black should start at approx. 25% an reach his maximum at 95%
>> >>
>> >> Thank? in advance for any input.
>> >>
>> >> Vladimir
>> >
>>
>> --

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