The RGB to CMYK Problem
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This image indicates the vibrancy difference between what your computer monitor shows and what will show up in print.
This can be disappointing when you’ve spent all that time creating a bright, vibrant design then find out the printed result won’t have the same vibrancy. Don’t despair. Remember that most full color prints you’ve ever seen are printed in the CMYK color spectrum.
If you’ve been designing in the RGB color space and want to preview what your design will look like converted to CMYK, there’s a free color conversion tool at rgb2cmyk.org.
Some printers will accept RGB files and convert them in house. We prefer seeing the CMYK output before going to the print house so we get a better idea of what the print result will be.