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 15:25:22 +0000
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- Thread-topic: Spot Colors | Alternate Color Space behaviour | PDF export.
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> 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> 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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