yellow prints muddy green

I scanned an image with a bright yellow background. I opened it in photoshop (mac version), saved as a tiff, placed in PageMaker. When I print the image the yellow turns to a muddy background with a sick green tinge. Why?
tamicreaAsked:
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cevrCommented:
Is it RGB or CMYK? Also, make sure your ICC profiles are the same setting in both programs.
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weedCommented:
When you scan an image its usually scanned into the RGB colorspace. RGB colorspace is capable of displaying about twice as many colors as a typical CMYK colorspace. When you print to a CMYK printer it has to translate those RGB colors into alot fewer CMYK colors. That muddy green is probably a "closest match" to that bright yelow you had in RGB. Throw in the fact that youre probably printing onto an inkjet printer with regular non-glossy paper and youre going to end up with some truly FUNKY colors.
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tamicreaAuthor Commented:
I'm printing on a Tektronix color printer (Phaser 840). The image was scanned as a CMYK and kept as a CMYK in Photoshop. However, I've found this to be a problem with just filling yellow in Photoshop and then printing. The CMYK sliders are 100% yellow so where's the green coming froom?
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weedCommented:
Perhaps your colorsync profiles are wacky. Is photoshop, pagemaker, colorsync set up correctly?
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neo2002Commented:
The problem is that your monitor is not displaying the true color of the graphic. Photoshop has a tool that sets your monitor to display true colors, or the color the graphic will be printed in.
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neo2002Commented:
in addition to the above ^

the tool (at least in 4.0.1..didn't run upstairs to check 5.0 or 5.5) is in File>Color Settings>Monitor Setup

You can try toying with the Printing Inks Setup there too.

You can also try setting your monitor to 16 bit or 24 bit true color, 32 even if your video card supports it. this may help.
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weedCommented:
If "The CMYK sliders are 100% yellow" then its not a monitor problem. Yellow ink is yellow ink..Thats just the way it is...What happens when you convert to RGB and print from RGB mode? Just out of curiosity.
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