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 <martin@idea-digital.com> wrote:
On 7 Mar 2017, at 10:45, Malcolm Mackenzie <mm@malcolmmackenzie.co.uk> 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
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