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Converting Mutli-colourd PDF in cmyk to two colours (black and Magenta or black and cyan)

I develop a print magazine every month and I send the final magazine to my printer as a PDF.  However, some clients send me PDF of there ads in full colour(cmyk).  Because my magazine is either black and white, black and magenta or black and cyan, the full colour PDF must be converted (this is all my print guy will accept).  How do I convert the full colour PDF to black and Cyan or Black and Magenta?

Thanks all,

Dave
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livewirewebsolutions
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livewirewebsolutions
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1 Solution
 
dandeliondreamCommented:
can't you try conveting it to black and cyan before esporting as pdf?
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livewirewebsolutionsAuthor Commented:
Yes, that is what I need to do.  How do I go about this?
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dandeliondreamCommented:
from my understanding, we can convert full colour to either "grayscale" or "invert colours". However, i never heard of converting to black & cyan or black & magenta. How can an image which is full colour, assuming using all colours be converted to only black & cyan or black & magenta. This is near to impossible.

May be what you want is just grayscale? black, gray white only.
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livewirewebsolutionsAuthor Commented:
No.  I think the printer uses 3 plates of black and one of Cyan or Magenta depending.  I'm not versed in this so I don't know.
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dandeliondreamCommented:
sorry i can't help either...may be you can try other forums like http://www.dpreview.com/forums/forum.asp?forum=1003
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BongSooCommented:
Dave, there are a couple of ways to do this, but it depends upon what software you have available?

Pitstop? Illustrator? photoshop?
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livewirewebsolutionsAuthor Commented:
Illustrator and photoshop
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dandeliondreamCommented:
BongSoo, pls share with us if you know how.
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BongSooCommented:
OK, first off, the caveat that this MIGHT not work in every instance, and that there are some admitted chances for error. Since I cannot see the PDF, I have to speak in general terms. Also, any client who really cares about their ad should be more than willing to provide you with either a correctly color broken ad, or the native files (and fonts) do do it correctly. Still, if thats not the case...

Here is a general overview. Feel free to ask more specific questions.

First, I assume you have acrobat? If you open the pdf, you should be able to double click on any of the images, right-click on it and save to disk (there is an easier way to export them too). Then you can open them in photoshop, and edit as necessary. I am still not clear on what your color breaks are, but depending upon whether you want a duotone effect or if you want separate colors, you may have to color break and save out as a different file type (Such as  DCS 2.0).

Second, you should be able to delete those images if necessary from the actual PDF.

Third, you should be able to open the PDF in Illustrator and edit the vector art as necessary (ie colorbreak). (again with the caveat that fonts might be an issue). Then you should be able to place the altered photoshop images back in, and re-save the file as a PDF.

Thats the simple version. There's always more to it, though.
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swabanikCommented:
Depending on the nature of pdf file you can do change colors with a 3rd party plug-ins called "Pitstop Professional". After the opening the pdf file you can change individual colors. delete any object etc. There are many actions also in this plugins to convert 4 color job to 2 color job. Try that one..

Alternately if you have Acrobat 8 you can get some features of Pitstop professional. A great tool for PDF Pro. .
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BongSooCommented:
Pitstop is a great tool, although I haven't had the privilege or opportunity to use it for over a year now. How much does it cost these days?
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swabanikCommented:
presently it's around $599 for the pro version.
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livewirewebsolutionsAuthor Commented:
Pitstop pro is great.  Thanks.
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BongSooCommented:
Wow. This question has been open since August. that must be some kind of record! :-P
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