Re: FOGRA52 & i1Profiler [subject corrected]
Re: FOGRA52 & i1Profiler [subject corrected]
- Subject: Re: FOGRA52 & i1Profiler [subject corrected]
- From: Claas Bickeböller <email@hidden>
- Date: Sun, 10 Sep 2017 15:55:33 +0200
Andy,
>
> b) the colour accuracy is given perfectly. So take a good given CMYK PDF and
> a corresponding print on an uncoated stock. If you proof the data with F52
> and a mechanical rough proofing substrate you will get a visual match that
> was never available in the industry before (for this kind of stock).
agree.
>
> c) from separation point of view here the bluish white point (and the
> corresponding grey balance) introduces some challenges for ICC workflows.
> This is based on the used CIEXYZ white point scaling, which moves all colour
> to the new white point and takes all colour with it (as defined per the
> pertinent ratio).
if using the relative colorimetric intent.
> Here the prediction is too bluish compared to what people would prefer to
> have seen neutral on the press (a little more yellow). So the („here not very
> visual plausible") computed CIEXYZ values are met perfectly with the used
> profiles - but this corresponds to a not perfect separation. See the example
> provided from Juergen Seitz.
> However we see this not for 80% of the use cases but for some high quality
> demanding customers that now need to optimise their colour server color
> transforms. This is something you can expect from distinguished prepress
> house.
> You cannot solve this problem with V2/V4 compliant ICC profiles!
You are referring to the relative colorimetric intent only I think.
You can easily solve this using the perceptual and saturation table which you
can fill with whatever you like. It is about the gamut mapping only and has
nothing to do with how you encode it.
So please don’t blame the ICC format. If you want to blame s.o. or sth. blame
bad perceptual mappings which brought people to using rel.col. instead of
perceptual as a standard RI.
I can create ICC profiles which give you consistent image appearance for
different printing conditions with different white points and different gamut
sizes and shapes.
Of course I'm not using ICC relative colorimetric rendering then but this
mapping is encoded inside the perceptual table.
regards
Claas
>
> regards
> Andy Kraushaar
>
>
>
>
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>> Am 09.09.2017 um 18:59 schrieb Graeme Gill <email@hidden>:
>>
>> Martin Orpen wrote:
>>
>>> The profiles from the 52 data aren’t useable.
>>
>> Seems to me then, that the data isn't usable - the profile merely
>> represents the data. Either that or something about how you are
>> trying to use the data-set/profile is out of sync with what it is
>> intended for.
>>
>> Graeme Gill.
>>
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