Take the 2-minute tour ×
Graphic Design Stack Exchange is a question and answer site for Graphic Design professionals, students, and enthusiasts. It's 100% free, no registration required.

I designed a poster in CorelDraw X5 for printing purposes. I was told by the Printshop guy to use colors only in CMYK. For the most part I did, I don't know why I missed it but I used one color in RGB model. I liked this color so much that I've used it at many places. So, current situation is some colors are in RGB model and some are in CMYK. So, I want to convert all RGB to CMYK and thought problem would be solved. But now I'm actually facing lot of trouble. Colors are not at all same. I hate the colors that it is showing me.

This is the color I used in RGB model (now I need to convert the same into CMYK model)

enter image description here

When I changed the Model to CMYK (in the drop down list box) the color it shows is really different. As you can see in the picture below. Its too dull.

enter image description here

One thing is The RGB values of both the colors is not the same. (I've highlighted them in red). What can I do to get the same color in CMYK? I did little bit of reading here and there. They say, that you can't get same. In that case, what is the closest one that I can get to? Is coreldraw showing me the closest one?

share|improve this question
1  
You should combine this with your other question instead of these being two separate questions: graphicdesign.stackexchange.com/questions/6108/… –  DA01 Feb 22 '12 at 8:04

2 Answers 2

up vote 4 down vote accepted

The range of colors that can be reproduced in any CMYK-only color (known in the trade as "Process Color") printing method is considerably smaller than the sRGB range of colors reproducible on a standard monitor. Here is an excellent video that demonstrates this visually using 3D color models.

It happens that one of the ranges of RGB color that can't be reproduced at all is in the relatively "pure" and saturated blues, and you've run into a problem that confronts many a beginning or untrained designer: "everybody's favorite color is blue," but blue doesn't print. This is not the only difficult range. Huge chunks of green and yellow-green, and all the bright reds and oranges just don't appear in CMYK at all. (There are ways to get many of these colors into print, but you have to go beyond just CMY and K into special inks to get there.)

I'm not familiar with Corel, so I don't know if it has a "gamut warning" feature similar to what you'd find in Photoshop or Illustrator to let you know that you're picking colors that are outside the range of CMYK "process colors". What I can tell you is that in this case Corel is trying to give you the closest achievable CMYK blue to the one you picked in RGB. Unfortunately, as you've discovered, it's not very close.

The other thing that may help is to make sure that your CMYK color profile is not set to the usual default of SWOP v2. Not only is this very out of date, it doesn't accurately reflect what is really achievable on modern presses. The best CMYK color space for most purposes these days is Coated GRACol 2006, which is also an ISO standard. If you can change your CMYK color profile to GRACol or FOGRA39 you'll find you have considerably better choices in the blue range. They're still nowhere near the full RGB gamut, but a definite advance on SWOP.

share|improve this answer
    
+1 for that excellent video. –  claws Feb 23 '12 at 7:38

Blues are some of the toughest colors to convert. Simply put, there are many RGB blues that can never be reproduced in CMYK.

Your best, and really only, solution is to find a CMYK blue you do like and stop trying to match the RGB color. That's not going to happen.

share|improve this answer
    
I don't have a printed catlog of colors. december.com/html/spec/colorcmyk.html shows conversion between RGB & CMYK for different colors. For example, The color I want in RGB (102,102,255) #6666FF is mapped to "cobalt(Safe Hex3) cmyk(60%, 60%, 0%, 0%)". So, can I blindly use these values of CMYK irrespective of how my monitor is displaying it? –  claws Feb 22 '12 at 8:11
    
Well, color conversion depends upon much more than some web site spitting out numbers. Profiles can change numbers a GREAT deal. I don't know how Corel handles CMYK or conversions to CMYk from RGB. But here.... #6666ff translated to 70C64Y0M0K and there is a noticeable shift and NOTHING in either RGB or CMYK I'd call "cobalt" (periwinkle if anything). I would again encourage you to stop trying to convert and find a CMYK blue you do like and use that. Trying to convert an RGB color to an out of gamut CMYK color will ALWAYS yield unexpected results. –  Scott Feb 22 '12 at 8:35

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.