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I am creating a logo and I am using Pantone 638U in Illustrator. I know Pantone has to be premixed but I just wanted to test print on my printer in CMYK. So I converted it to cmyk which is C83 M0 Y10 K0. My document is in CMYK mode and I am using View > proof colors. Here is a photo of what result I am getting. The left is on screen and the right is (approximately) the printed result.

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Is this the only color you are having an issue with? How about the rest? – Yisela Mar 14 '14 at 3:56
Its a one color logo with black text. The text comes out fine and crisp, but the logo comes out more navy blue than teal/sky blue. – Janice Barnhill Mar 14 '14 at 4:01
Something you are using is absolutely not calibrated correctly. – Scott Mar 14 '14 at 9:31
I would look into color calibration and invest in a Pantone book. – Darth_Vader Mar 14 '14 at 13:43
Try sending an RGB file to your printer. Most end-user inkjet printers are confused when you send them CMYK data. – Scott Mar 14 '14 at 14:06

There are a few issues here:

  1. Pantone colors are spot colors. They are custom mixes. Not every Pantone color can be replicated in CMYK. As such, there will be a shift when converting from Pantone to CMYK.

  2. Screens are projected light. Ink is reflective light. Screens and Ink can't replicate all the same colors. So what you see on screen isn't always what you will see on press.

  3. Your screen may not be calibrated to make even a close approximation of what you'd see in print. Few are.

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