RGB workflow - really a bad idea?

Hi
Having a "discussion" with my printer - I got back an offset job that was magenta shifted - especially in the cyan of a sky in a photo. My current workflow is to place everything as RGB, and then to convert to CMY on out to PDF. For this job I used the ISO coated 300% ECI profile for the conversion, and embedded the profile. I preflighted the PDF and all was fine, did an inhouse proof from the PDF (mine on the left). In house proofed on epson4000
with RGB ink ( in know it wont be colour accurate - but its usually pretty close this is probably a little cyan shifted). My Printer is telling me that the colour shift in the mountains is down to using an RGB workflow. I dont understand why there would be any difference between
>converting to CMYK profile on export and
>converting to CMYK profile in photoshop, then placing into indesign.
If this workflow is a bad idea can anyone point me to a good resource - I've been looking for a robust workflow that will work for most printers for a while now.
thanks!

Thisis not a technical reply, but may be helpful none the less...
RGB workflow is not necessarily a bad idea, but depending on your printer, not necessarily a good one either. Every printer is different, but with gang run printers - they're not usuaslly bred to be concerned with your color.
Communication is key and the only really bad idea is avoiding or overlooking a complete job dialog with your commercial printer. Not that either is intentional. I would say that no matter what, you should always get a contract proof, but since this is a gang run printer... Try, and good luck.
This is a pretty touchy subject because it is not always just technical. Even the finest of printers are not usually happy color conversionists. What do printers do? Printers print. And they print CMYK. Printers will nearly always take the responsibility for color issues when you supply them with CMYK files.
100% of offset commercial printers (50 surveyed) said they "prefer CMYK files with no color profiles" in a confidential corporate survey. The point of contact in these surveys were prepress. (Now I can get technical with the profiles and excurves, but there will be more of that coming your way than you would care to know at this point, I am sure).
I would suggest learning to communicate well with my printer - going as far as becoming a self appointed inhouse designer. Make them comfortable with you, get comfortable with them, learning an RGB to CMYK workflow either eventually making my own conversions, working your files so all they need to do is run an excurve on their rip or educating them to a level of empowerment so they will want to take the full responsibility of converting for you. Either way, you have nothing to lose by learning CMYK - It just give you more leverage and color control.

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Attachments:
settings screen.PNG ‏181 KB

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Roger Wilmut1 wrote:
Csound1 wrote:
That was going to be my riposte,
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RogerMac wrote:
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>
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>
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