Why do colors with identical cmyk numbers look very different?

i thought i had this problem solved, but here it is again with a new wrinkle. i have this gorgeous orchid bg box, cmyk 9-10-0-0 in a file with cmyk transparency blend space. same set up in file 2. i create a new bg box with the same numbers and it's a whole different color. there must be some parameters mismatched. what else should i be looking for to make sure the file setups are identical?

Attached is an image of what the color picker looks like after I have used the eyedropper to sample what I believed to be a swath of CMYK color.
It looks to me like the image you are sampling from is an RGB image. You can check that by opening the Links panel and clicking on the link, which will display the image's color space and profile.
actually, what i'm sampling--the lavendar bg on left --is color i created in ID; it's not a link. i thought i created it in cmyk; how can you tell it's rgb?
If you are picking up an out-of-gamut color from an RGB image, you can't match that color with a CMYK fill. You could make the background fill an RGB color and get a match. In that case both the fill and the image would get separated to the same CMYK mix on output to a CMYK device.
which does have a CMYK transparency blend space and separations preview in output.
You are confusing the Transparency blend space with a document color space. The Transparency Blend Space only comes into play if you have transparent objects that need to flattened. It has no effect on non-transparent objects.
hmmm, that's not my experience. so far as i can determine, i have no transparent objects, and yet the color on screen changes dramatically when i switch transparency blend space from rgb to cmyk.
why does changing from View to Separations within Separations Preview change the color of my CMYK background so dramatically?
Your background isn't CMYK it's RGB. When you turn on Overprint or Separation Preview, you get a preview of how your out-of-gamut RGB violet color will convert to CMYK.

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ray7199 wrote:
I'm trying to save a photo with a CMYK color profile to send to a company who will print it for me. I've looked at the color profiles installed on my computer, and quite a few CMYK profiles appear to be there (in /Library/Application Support/Adobe/Color/Profiles/Recommended).
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Why do colors with identical cmyk numbers look very different?

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