Convert RGB Logo to CMYK

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This customer received 13 logo designs from 9 designers. They chose this logo design from ZainabFH as the winning design.
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The job is to fix the logo. Remove the purple colors
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I have a logo that looks great as png (blue), but unfortunately the printouts have a different color (purple). Who has the skills to fix this? I know that there is a CMYK mode for both Photoshop and Illustrator, but I also know that there is no automatic conversion from RGB to CMYK. That's why I need you.
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I need a CMYK logo that prints blue, not purple
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I provide psd+ai files for
- businesscard
- letterhead
- postcard 1
- postcard 2
- logo on black / transparent
- logo on white
- voucher
you fix them all to have the same color in print as the "REFERENCE.PNG" file has on screen (blue)
Updates
Thanks for your submissions so far.
Added Wednesday, October 05, 2011
Hi, thanks for the sample files so far. To make it clear: the job is to fix the logo colors. I can convert the files to CMYK that is not the issue. The problem is to fix the logo colors.
Added Thursday, October 06, 2011
Hi, thanks for your submissions!
Added Friday, October 07, 2011
Logo Text
(None provided)
Look and feel
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Upmarket
Requirements
Must have
- printable on white paper
blue-on-black RGB looks exactly the same (see png)
blue-on-black CMYK printed looks like the png