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I have A0 poster with 2 science images that were taken by a spacecraft. On top of it I have graphs and some text. When I print it as A4 pdf on my office small printer - the colors are fine. When I print it as A0 on my university poster printer the colors are bad in multiple ways - over saturated, faded and etc. However, the text and graphs that I added on top of the images are totally fine! I work in Adobe Illustrator CMYK format of course! Help!

P.s. I have had a few step (compression, cropping) in Adobe Photoshop if that matters at all. Poster printer is HP DesignJet Z2100 Photo Printer.

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    Maybe your university printer uses rgb instead of cmyk? Just try to print in rgb. – mikey Aug 7 '19 at 15:14
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The printing options of a desktop printer and a photo printer can vary a lot. There are several factors that influence a good printing:

  • Monitor Calibration
  • Document color profile
  • Paper type

Assuming all this is correct on your computer and document, reading on the HP DesignJet Z2100 Photo Printer site, there's a step by step to follow before printing a color photo that you should follow:

https://support.hp.com/us-en/document/c00744560#AbT10

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    The other is, of course, that most 'consumer' [& even some commercial these days] printers don't want CMYK at all, they want RGB, usually just sRGB. – Tetsujin Nov 10 '18 at 12:53

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