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TIPS, converting RGB to CMYK.

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  #1  
Old 09-24-2011, 12:37 PM
P_fuzz P_fuzz is offline
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TIPS, converting RGB to CMYK.

I am finishing retouching an editorial and some portraits to a mag and they need it in CMYK.

to the pros and people that have been trough this... are there any tips when converting the file from RGB to CMYK on CS5 I should look for.

thanks
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Old 09-24-2011, 12:45 PM
andy625 andy625 is offline
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Re: TIPS, converting RGB to CMYK.

in RGB view>proof colours
anything grey will be out of gamut it's good practice to keep this on if you working for print.

calibrated monitor would be ideal also, what you see isn't always what you get.
it's probably going to be lighter on screen than print.

unless you have the profile of the printer and produce a proof based on that you aint gone be able to tell how the final prints going to turn out.
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Old 09-24-2011, 12:54 PM
P_fuzz P_fuzz is offline
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Re: TIPS, converting RGB to CMYK.

but should I carry on my retouching as usual and then convert the final TIFF file for print... or proof colour from start?
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Old 09-24-2011, 12:56 PM
Flashtones Flashtones is offline
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Re: TIPS, converting RGB to CMYK.

Quote:
Originally Posted by P_fuzz View Post

to the pros and people that have been trough this... are there any tips when converting the file from RGB to CMYK on CS5 I should look for.

This link downloads a very nice PDF by Jeff Schewe on prepping files (including CMYK conversion) for delivery to client.

http://www.adobe.com/digitalimag/pdf..._reproprep.pdf
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Old 09-24-2011, 12:59 PM
andy625 andy625 is offline
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Re: TIPS, converting RGB to CMYK.

it's down to preference.

i work in rgb 98, the gamuts larger do all the retouching colour adjs in that then at the last point convert to cmyk.
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Old 09-24-2011, 01:03 PM
andy625 andy625 is offline
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Re: TIPS, converting RGB to CMYK.

Quote:
Originally Posted by andy625 View Post
in RGB view>proof colours
anything grey will be out of gamut it's good practice to keep this on if you working for print.

calibrated monitor would be ideal also, what you see isn't always what you get.
it's probably going to be lighter on screen than print.

unless you have the profile of the printer and produce a proof based on that you aint gone be able to tell how the final prints going to turn out.
that bit i said about being in grey is wrong, you need to have gamut warning on for that
view>gamut warning
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Old 09-24-2011, 01:05 PM
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John Wheeler John Wheeler is offline
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Re: TIPS, converting RGB to CMYK.

ADDED EDIT: Lots of good inputs posted almost simultaneously so my post may be mostly a repeat

Hi P_fuzz

I am not a professional where I have had to do this so my inputs are from the Photoshop side only (take with grain of salt)

I agree with Andy if you can get a specific profile and a proof.

There are two ways to get into CMYK in Photoshop

1) Use Image > Mode > CMYK
The conversion will be done with the CMYK profile that is set under Edit > Color Settings
So what is important is that you have the Color Settings set the way the magazine would like to have them (there are many CMYK profiles)

2) Use Edit > Convert to Profile
Using this Command you have to choose a specific profile and it ignores what is set as the default in the Color Settings dialog.

In either case, there are situations (such as with Smart Objects) that it will ask to rasterize the image. I have found that when you don't rasterize, you can get bad results so watch out for that. Hope this is helpful.
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Old 09-24-2011, 01:32 PM
andy625 andy625 is offline
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Re: TIPS, converting RGB to CMYK.

also something else is maybe strip out unwanted 'dirtying' colours.

by this i mean in selective colour,
say something is meant to be red strip the cyan out,
something is green strip the magenta etc..
it will make the print cleaner.

red > strip cyan
green > strip magenta
blue > strip yellow

maybe mask certian areas..
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Old 09-24-2011, 03:07 PM
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andrewrodney andrewrodney is offline
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Re: TIPS, converting RGB to CMYK.

If you don’t have the proper profile for the conversion, you’re playing with fire! And I mean the actual profile that correctly defines the print process (not someone saying “we print SWOP”).
http://www.ppmag.com/reviews/200703_rodneycm.pdf
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Old 09-24-2011, 03:52 PM
Flashtones Flashtones is offline
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Re: TIPS, converting RGB to CMYK.

Andrew, I'm curious. if a printer requests a SWOP file and person gives them a file converted to and tagged or identified as SWOP, how many can't hit it? And why would they request it if they can't

Last edited by Flashtones; 09-24-2011 at 04:45 PM.
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