Re: FOGRA52 & i1Profiler [subject corrected]
Re: FOGRA52 & i1Profiler [subject corrected]
- Subject: Re: FOGRA52 & i1Profiler [subject corrected]
- From: Terence Wyse <email@hidden>
- Date: Mon, 04 Sep 2017 09:09:32 -0400
What does the ramp of pure K look like on an a*/b* plot? Is it extremely
warm/yellow that there needs to be only CM and no Y in the gray ramp when the
amount of K generation is jacked up?
Sent from my iPad
> On Sep 3, 2017, at 8:05 PM, Martin Orpen <email@hidden> wrote:
>
> I wanted to bump this thread from March on to the list again.
>
> We need to create variants of Fogra 52 with increased K generation, but the
> results are terrible.
>
> The Fogra 52 data produces neutrals composed of CMK and zero Y in both
> i1Profiler and Argyll.
>
> This is the exact opposite of what we need on press
>
> Why is this happening?
>
> Is this just a problem with i1Profiler & Argyll — which work as expected with
> every other Fogra data set?
>
> Or are the ECI making additional edits to create their profiles using
> Heidelberg software from this data set and not declaring it in the
> specification?
>
>
>
>> On 7 Mar 2017, at 11:51, Martin Orpen <email@hidden> wrote:
>>
>>
>>> On 7 Mar 2017, at 10:45, Malcolm Mackenzie <email@hidden>
>>> wrote:
>>>
>>> I did a few tests in i1P and confirm your findings.
>>> The "Intelligent Black" feature does odd thing when it thinks TAC should be
>>> low and the Max K separation/width is
>>> contributing to the low yellow. I've had issues with the settings for
>>> digital as have others online.
>>> I remade the profile with the same data and it was fine, so it's an i1P
>>> thing.
>>> I've never got an answer or seen one from X-Rite on the issue.
>>
>>
>> Malcolm
>>
>> I also used ArgyllCMS and the results were the same, so I think that the
>> Heidelberg software (or the operators) are editing out some of the FOGRA52
>> data.
>>
>> The neutral curves of the “official” profile have a distinctive relative
>> intent shape at L30 where cyan exceeds black and yellow drops away. But the
>> drop is only from 42.8% to 40.6% where it is artificially held in a straight
>> line.
>>
>> i1Profiler and Argyll create high GCR profiles which max out with yellow
>> somewhere around 15% which then drops to zero as the cyan values climb
>> steeply.
>>
>> I think that the data either needs editing or an explanation of why the
>> Heidelberg software is able to create a profile that can’t be matched by
>> other profile making apps.
>>
>> The FOGRA51 data is isn’t much better either, but easier to spot why it’s
>> problematic when it contains readings like this:
>>
>> c100.0 m100.0 y0.0 k100.0 = L11.43 a5.76 b0.01
>> c100.0 m100.0 y100.0 k100.0 = L12.71 a0.53 b4.89
>>
>>
>>
>> Regards
>>
>> --
>> Martin Orpen
>> Idea Digital Imaging Ltd _______________________________________________
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