Re: Replacing CMY with K in Photoshop CS3
Re: Replacing CMY with K in Photoshop CS3
- Subject: Re: Replacing CMY with K in Photoshop CS3
- From: Marco Ugolini <email@hidden>
- Date: Thu, 5 Jun 2008 10:32:25 -0700 (GMT-07:00)
Jesse wrote:
>Does anyone have any experience on taking a CMYK mix heavy in CMY, and somehow converting it to a GCR mix to save on ink? For instance, taking something like 45, 41, 35, 2 and converting it to (just an assumption)10, 6, 0, 37 in photoshop. Is there a function that handles this, sparing a person from doing any guess work?
Hi Jesse.
You probably know that the gray component in a CMYK mix depends on the specific type of CMYK process that one is working with. The balance of inks for the gray component in SWOP is different from that in Sheetfed, and so on. If you use ICC color management, the black generation is directly tied to the ICC profile embedded/assigned to the image file and to the type of GCR and Total Area Coverage (TAC) that it is built to use. Those cannot be changed.
The type of maximum GCR you are mentioning (in which you zero out the contaminant ink, in this case the yellow, and completely substitute it with black) can be calculated manually with ProfileMaker's ColorPicker, which can be downloaded from the XRite site and run in a limited demo mode.
(ColorPicker is part of the ProfileMaker suite of products, which can be freely downloaded from this URL: <http://tinyurl.com/49hgxm>)
As far as I know, this type of calculation cannot be determined and applied as easily in Photoshop, at least not with a standard ICC CM workflow.
Using the CMYK Setup legacy color engine would be one way to go about directly controlling the black generation, but that is a mechanism that is *completely separate and independent* from the ICC color-managed workflows. In other words, you either work with ICC CM, or you work with CMYK Setup. No mixing of the two is possible.
I would like to know if others in this forum can offer options that I am not aware of.
Best of luck.
Marco Ugolini
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