Re: CMYK to CMYK conversions
Re: CMYK to CMYK conversions
- Subject: Re: CMYK to CMYK conversions
- From: Jim Rich <email@hidden>
- Date: Fri, 13 Oct 2006 12:31:06 -0400
- Thread-topic: CMYK to CMYK conversions
Greg,
If you are in a position to work in RGB then you want to consider finding an
color space that works for you. A lot of folks use Adobe RGB. Then retouch
and archive your masters in that color space. This is the most advantageous
way to work. But this approach is not always possible.
In that type of workflow you than convert to different flavors of CMYK
depending on where the file will be printed.
As for CMYK let me ask a few questions.
How did the file that you are receiving or creating get turned into CMYK?
Is it a legacy file say from a CMYK scanner?
Or was it converted to CMYK in Photoshop?
And if it was converted to CMYK in Photoshop what profile was used?
A good guess is that the SWOP v2 profile was used for the color separation.
So SWOP v2 would be the CMYK space that a lot of files are normalized to.
No one really knows, but my guess is that over 51% of CMYK files in the
world get converted using that profile. And that is a conservative guess.
If you are asking what is the best way to get a file to CMYK and use that
CMYK file for repurposing, I don't know if there is one answer.
But consider this, there has been a move in the standards world for color
printing over the last few years to be able to define a standard printing
conditions for printing on a #1, #3, and #5 sheets for example. This is
often referred to as ISO-12647. Just recently it has been agreed that
standard move forward to be updated using the G7 press calibration method
that the Gracol committee has been working on.
The expectation of this standard is to be able to print the same file on the
same paper on different press that are calibrated the same way. I think
there is a good chance this is possible.
>From this work will come a set of icc profiles that are based on ISO 12647.
I believe you can get the data at Gracol.org. I think data for the profiles
will be called something like Gracol #1 2006, SWOP #3 2006 and SWOP #5 2006
and they are close to be finalized.
This is still a moving target, but if and when the ISO 12647 specification
update happens and say Adobe creates profiles with that data and provides
them in Photoshop, I think at this moment, that by converting your CMYK
files to one of them, say based on your most common in-house printing would
be prudent as a way to have a master CMYK color space.
That's the theory.
Stay tuned.
Jim Rich
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