Re: Spot Colors | Alternate Color Space behaviour | PDF export.
Re: Spot Colors | Alternate Color Space behaviour | PDF export.
- Subject: Re: Spot Colors | Alternate Color Space behaviour | PDF export.
- From: Axel Robert via colorsync-users <email@hidden>
- Date: Thu, 9 Jun 2022 17:03:04 +0000
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- Thread-topic: Spot Colors | Alternate Color Space behaviour | PDF export.
Hello Mike.
Nice to meet you.
Thank you for your explanations.
But I’m wondering if I finally did not explain my issue in a wrong way. ☹
Because it’s not a RIP or DFE matter.
The problem occurs at the beginning of the stage in the PDF itself.
The Spot Color should be known with an Alternate Color Space in CMYK or Lab.
And in such a manner, the result would be to read Lab or CMYK in it, right?
However, The Alternate Color Space is tagged as ICC profile which is obviously
odd.
So, my question is more about what happens during the export from the native
file before any further transformations in a prepress workflow. 😊
Best.
Axel
From: "typhoon correctcolor.org" <email@hidden>
Date: Thursday 9 June 2022 at 18:28
To: Axel ROBERT <email@hidden>
Cc: Jon Meyer <email@hidden>, "email@hidden"
<email@hidden>
Subject: Re: Spot Colors | Alternate Color Space behaviour | PDF export.
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Axel,
Actually, the way you describe spot colors in Illustrator should be irrelevant.
If printing to a traditional press, then a spot color should be an actual
’spot’ color, and a separate plate, and as long as it is, and you ink up that
fountain with the right ink, it works.
If printing to digital, the ’spot’ color is a L*a*b* value, but in the RIP, and
that L*a*b* value in the RIP corresponds to the spot color name. The name is
all that matters in the file. The name in the file must correspond exactly to
the name in the RIP that is associated with the L*a*b* value that spot color
should represent. If it’s a true spot color, the RIP will disregard any color
information in the file and attempt to print that L*a*b* value, provided it
recognizes the name, meaning that the name is in its spot color library, and
that library is turned on.
Somewhere in your conversion, there’s always a “convert spots to process”
option. That needs to be disabled.
If your spots are coming through with any color information other than that
they are spot colors, that would be the first place to look.
Mike Adams
Correct Color
On Jun 9, 2022, at 10:25 AM, Axel Robert via colorsync-users
<email@hidden<mailto:email@hidden>> wrote:
Hello Jon.
This transformation unfortunately occurs in the Adobe export process itself
before doing any ripping action afterwards.
I know that Spot Colors shall be describe in Lab (even if some former Adobe
Pantone swatches are still in CMYK).
But the problem arises in the process from the source file to final PDF export,
so far.
That's why I don't understand this behavior, so far.
Sincerely.
Axel
On 09/06/2022 17:02, "Jon Meyer"
<email@hidden<mailto:email@hidden>> wrote:
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Hello Axel -
The only correct way to describe spot color is in L*a*b* values. This is
supported in Illustrator.
I would not waste time with attempting to rig another workflow (unless your
RIP is not L*a*b* compliant - in which case one must reduce expectations to
just pleasing color).
Jon
On Jun 9, 2022, at 10:03 AM, Axel Robert via colorsync-users
<email@hidden<mailto:email@hidden>> wrote:
Good afternoon.
I was wondering if somebody else already experienced and solved this problem,
as well.
We built, dedicated to creative agencies, a specific color settings and pdf
export couple for certain production files in which we manage ourselves the RGB
to CMYK conversion. It’s almost a late binding workflow before sending the
final PDF to our printers.
So, all raster images remain in a specific RGB color space while Benday and
vectors are still in CMYK.
So far, we did have any issue, but we recently received a document with a Spot
Color template in it.
And when we checked it, it appeared it had been tagged on the Alternate Color
Space with an ICC profile (no more specific indication).
We tried to find why without any success.
But we also experienced the same after many tests in In Design and Illustrator
by creating a simple vector shape to which we added a Spot Color from the
latest Pantone library.
The PDF export has no color conversion except an OI and OC for the PDF itself.
And despite all the color swatches we use, the result is equal.
The only difference lies when we use a PDF Export Preset which converts colors
to the destination.
In such a way, the Spot Color uses the CMYK mode as by default Alternate Color
Space.
How is it possible?
Would you have any idea?
Thanks!
Axel
UBISOFT | Axel ROBERT |Senior Manager, Prepress & Quality
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