Take the 2-minute tour ×
Graphic Design Stack Exchange is a question and answer site for professional graphic designers and non-designers trying to do their own graphic design. It's 100% free, no registration required.

Occasionally a science journal asks authors to submit figures as CMYK (JPG or TIFF) for publication. When I have done this in the past, the colors in the figures end up looking very muted and washed out - even when published in print format. What I don't understand is that these same journals have published articles from others where the figures are nice and vibrant both in print and online in PDFs.

My question is whether there is more than one way to convert RGB color to CMYK. The tools that I have tried (Adobe acrobat, Adobe Illustrator, Deneba Canvas, Apple Preview) all produce the same muddy images.

Is CMYK actually too restrictive of a color space for modern printers? Doesn't it presume that there are only 4 colors of ink in the printer?

I'm guessing that other authors have ignored the publishers request, and have submitted their figures in RGB or some other expanded color space; perhaps the publishers hardware are capable of a wider range of color than CMYK allows -- or is there more than one way to do the color conversion?

share|improve this question
add comment

3 Answers

Yes, there is no 'one' way to convert between the two.

What will probably help is to get the proper color profile setting from the publisher. You can then use this profile in your software to ensure a better conversion.

Ideally, though, the vendor would be handling the conversion themselves as they are ultimately the ones printing it.

share|improve this answer
    
Thanks for the input. I'll check with the publisher to see if they can provide a color profile, although I'm not too hopeful. I also noticed that Adobe and Canvas give a couple of options for color conversion "inent": Perceptual (Images), Saturation (graphics), Relative colorimetric, and absolute colorimetric. Some of these (perceptual and relative) don't seem so bad. –  Matthew Sep 24 '13 at 19:23
    
@Matthew: it is important to understand that the monitor is an independent device which alters color after the rendering intent and software. The goal is to have the image as displayed on the device you are using to judge the color match the output from the press, not look good on the monitor. A subtle difference to be sure... –  horatio Sep 24 '13 at 20:19
add comment

It is very likely that people ignore the specs and the pre-press people at the journal are making the conversions. There is a lot of information and confusion surrounding this topic, but the simple answer is: testing.

What you need is a monitor that you can trust so that what you see on screen is as close as is acceptable (to you) when printed by a printer. To know if it is close, you need to find a printer who will pull proofs for you (cheaply) so that you can do some testing. Good printers tend to calibrate to similar (or even the same) target and they are pros, so if you get it set up well with one, you will probably have decent results with many.

I have one monitor in my setup which is trustworthy. I used a monitor calibration device on it (which can be rented from camera shops), and I disable the use of embedded profiles. None of the other monitors I have, even calibrated, simulate CMYK well.

Basically, I have calibrated the monitor, and then made adjustments to the display profile in e.g. photoshop based upon printed results. This is obviously a specialized calibration.

You should be aware that CMYK vs RGB is more than just a color gamut difference: in addition to the additive/subtractive difference in the color models, CMYK tends to look flatter because it relies upon the white point of the paper which is a lot duller than the white point of a monitor.

share|improve this answer
add comment

For optimum results simple conversion is rarely enough.

It generally takes conversion to CMYk, then image adjustments to tweak the colors. This is especially true if original areas of color fall outside the CMYK gamut.

share|improve this answer
add comment

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.