Color Information?

How can I put a color image on a b&w background and convert the image to cmyk and have only black and white color info on the background, but cmyk on the color parts.
patrickm3Asked:
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weedCommented:
Create/open your intended black&white document and set it to Bitmap or Greyscale mode. Then change it back to CMYK. Now create a new layer and paste in your CMYK image overtop the grey. Since black is part of CMYK (K=Black) the background will print with black ink while the foreground will print with CMY+K.

Thats the easiest way to do it. You could also play with spot color channels, duotone, tritone, quadtone, etc etc.
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patrickm3Author Commented:
I still need to know how I can flatten the image and keep the b&w on the k plate and not have any other color in it.

Thanks
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weedCommented:
The black parts will be on the K plate anyway because the image is CMYK. The C will be on the C plate, the M will be on the M plate etc etc.

Ill try to describe it this way...

When you have a CMYK image each color represents a plate on a print press. When you print to those plates the image will separate into the 4 colors, 1 color per plate. Since the middle part of your image is only black or shades of grey it will automatically be put on the K plate. It doesnt have a choice because there are no other colors in black.
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patrickm3Author Commented:
Weed,

     I did what you recommended the first time I tried to uotput the ad.  It gave me the B&W part of the image on all four plates.  When I flattened the image, it appears as though I got color info on everything.


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weedCommented:
In photoshop go to File-Color Settings-Greyscale Setup....make sure youre using BLACK ink for black instead of a mix of RGB. If youre using 3 colors to simulate black youll get weird output when you go to cmyk.
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patrickm3Author Commented:
Unfortunately, I use photo 4.0 for my newspaper output because it has a better color and ink control-how would this be possible in 4.0?


Thanks

patrick
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weedCommented:
Yikes...thats a rather vital detail...I would assume it would be similar to 5.5 or 5.0 but i havent used 4.0 in so long that i cant honestly remember. I would suggest going to 5.5 because its color is far superior to that of even 5.0 which used adobes sRGB default which messed up many a print. 5.5 also supports spot color channels. Other than that i dunno. The option to use black ink for black pixels should be around there somewhere but i couldnt tell ya where.
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