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What four-color is

I was reading a book today and the author mentioned a "four-color photo". Since she is in the publishing business, and I am a Graphic Designer, we know what it means. But if you don't, I really can't blame you. It's a very old term, but it's still around. And if you are a Graphic Designer working in print, and using InDesign, you need to know it.

Four-color means full color, as in a color photo, that is printed on a printing press. Sometimes it is referred to as "Process Color", or sometimes just "process". CMYK are the four ink colors that are used on a printing press. In case anyone asks you, this is what CMYK stands for

• C - for Cycan, a light blue
• M - for Magenta, a kind of purplish red
• Y - for Yellow
• K - for Black. K is used to avoid confusion with Blue. And black is known as the "Key" color.

Pick up any magazine and look really, really closely at the photos and you will see a tiny "rosette" pattern made up of these four colors. No, they're not pixels! They are the four-color process that has been in use since its invention over 80 years ago. These dots are sometimes called the "line screen". It started with a photographic process and is still how all high-quality and high-speed printing is done today.

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