On 30 Aug 2017, at 15:31, Robert Brenstein via use-livecode wrote:

The stack is used to produce a PDF file and the printing shop requested CMYK

A slight aside – please forgive me.

I teach publishing and have worked in the print industry (among others) since the 1980s. It's now the norm for printers to accept PDFs with embedded RGB images and do the colour conversion to CMYK in the final RIP stage as it's printed. This means that the actual conversion is done with settings that are most appropriate to the actual print method and device, not a generic 'make it CMYK' process. I've seen print projects go expensively wrong because of inappropriate CMYK conversion settings.

This is often known as an RGB workflow – although 'Hybrid workflow' is more accurate, as it's just imported images that are left in their native colour model; colour swatches should still be specified using the colour model of the intended output process.

Having said this, the bottom line is always "ask your printer and follow their advice," not least because if something goes wrong with the colour repro they can't blame you. ;)



Keith Martin
Senior Lecturer, LCC (University of the Arts London)
President, http://IVRPA.org
+44 (0)7909541365

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