Re: FOGRA52 & i1Profiler [subject corrected]
Re: FOGRA52 & i1Profiler [subject corrected]
- Subject: Re: FOGRA52 & i1Profiler [subject corrected]
- From: Martin Orpen <email@hidden>
- Date: Wed, 13 Sep 2017 10:13:34 +0100
> On 12 Sep 2017, at 14:18, Graeme Gill <email@hidden> wrote:
>
> Martin Orpen wrote:
>
>> Here’s a picture of a viewing booth:
>>
>> <https://twitter.com/orpen_m/status/907238189580025856>
>>
>> These are CMYK separations to various profiles built using the FOGRA52.txt
>> data (and a couple using the 47L data). Proofs simulate FOGRA52 on matte OBA
>> media using a SureColor P5000 with the violet ink set.
>
> Right, so you are using the Fogra52 as an input profile in a proofing workflow
> to an Epson P5000 ?
Yep.
>> For the sake of argument, let’s say that I like BVDM’s Mr Low Key when we
>> convert from ECI RGB to the ECI's PSO Uncoated v2 profile.
>
> Sorry, what exactly is "BVDM’s Mr Low Key" ? - can you provide a reference ?
There are 3 images in the viewing booth shot at Twitter link above.
They are from the BVDM Roman 16 test data and, for the absence of doubt, are
actually named lowkey midtone & highkey.
Useful for running tests but in this case you can separate and rgb grey ramp
and see what I’m talking about.
>
> Not PSOsc-b_paper_v3_FOGRA54.icc ?
Nope. I’ll get around to complaining about that profile in 2020 when the first
client asks us to use it on a job :)
>
>> If I create an ICC profile from the FOGRA52.txt data using *any* of the
>> software tools that I have at my disposal, including Argyll, I cannot match
>> Mr Low Key.
>
> I'm not clear on what you mean by "match Mr Low Key", since'
> your workflow is still opaque.
>
>> All variants result in an image that is far too blue.
>
> I gather from your following email that this was with perceptual intent.
The workflow here is quite simple:
You are working on an ad campaign which has a colour image on one page and a
black and white image on the other.
The aim is to have them match but get through an ad gateway that will reject
any black & white images that have more CMY than K.
With 52 you get a colour image that lacks yellow on the colour page and the
equivalent of an ugly black & white photocopy on cheap copier paper on the
other.
If I want a -kx (or similar) profile from Argyll that matches the a 1.1 b -0.5
black of the ECI profile, what modifiers do I need?
Rejecting the ECI profile isn’t an option for us as somebody further up the
production chain will have already used it and approved it for colour — we need
to be able to match it.
And once we’ve done that we will also need to match the yellow boosted GMG
version because they don’t do GCR adjustments unless you buy into their Ink
Optimiser technology :(
And I really don’t want to have to go back to the prehistoric method of
manufacturing a rich black version of a greyscale image as it puts all that
useful data in the standard to waste.
Regards
--
Martin Orpen
Idea Digital Imaging Ltd
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