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What is 6 color printing, is it multicolor process printing? What setting do I have to keep in Photoshop, Do I have to create an extra channel in the channel palette?

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6C Hexachrome

The digital Hexachrome printing process uses CMYK inks plus Orange and Green inks. With Hexachrome you have a wider color gamut and it may produce better, more vibrant images than 4C alone.

Preparation

Before preparing a print project for 6C or 8C process printing, talk to your printing service. Not all printers offer 6C/8C process printing or may only offer specific types of digital and/or offset color printing, such as only digital Hexachrome. Additionally, your printer can tell you how best to handle color separations and other prepress tasks when preparing files for 6C or 8C process color printing.

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    Notably: (1) in Photoshop, adding two (random!) channels will not Make It Hexachrome; this needs a special separation plugin. (2) Pantone discontinued their Hexachrome range of products in 2008, and the web pages describing them are offline. – usr2564301 Feb 11 '15 at 21:54

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