RGB to CMYK…HELP !!!

M
Posted By
mark4man
Aug 25, 2005
Views
307
Replies
3
Status
Closed
People,

For all the photo images I used for a 16 page Insert Booklet design for my upcoming CD release (which started out their life as RGB’s), I used Photoshop 6 for processing (processing RGB’s as RGB’s, as Photoshop recommends)…& then I converted them to CMYK (also in Photoshop 6.) Then I placed these converted images into the Adobe Illustrator (10) design templates provided by the replication service, finalized everything; & sent them off.

Today I got the proofs back from their print division; & all graphic content is DARK & GREEN !!!

I contacted the graphic arts dept. at the replication service; & they told me they could color correct them at their end, based on the color prints I sent them…but when I learned the cost…I thought it might be best to just do it at my end.

1) First of all…what happened? The photos looked great in both Photoshop & Illustrator on my monitor as RGB’s. When I had converted in Photoshop, there was no difference at all in appearance. My working spaces in Photoshop are all default; & the photos look just like they do on my monitor when they print out in my project studio (on a typical HP Ink Jet.) I don’t mess around with Adobe Gamma or calibrating my monitor (because…the images on my system look exactly as they do in real life…so, why calibrate the monitor to match the commercial systems, which would make every image on my system dark & green…in which case I’d have to adjust them all back to real life colors, which I already have now!!! To my mind, the conversion process should be set up to exactly match the 4 color standard…calibrating the monitors to match print output is ass-backwards.) Anyway, It’s gotta be something else.

2) How can I fix this problem? Is this common? Is there some other way to go back & convert the RGB’s, or is there some criteria I can use to color correct them in their present state as CMYK’s? Does Paint Shop Pro do a better job of conversion (with their "split channel" thing)? It’s very frustrating…all I want is for them to look like they do on my monitor & as printed by my printer. Now…I have to put the graphics portion of my CD on hold while this is getting sorted out…which pushes back my release date.

Will be appreciative of any help,

mark4man

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H
hpowen
Aug 26, 2005
Get yourself a Pantone Process Guide
( http://about.pricegrabber.com/search_getprod.php/masterid=27 4258/search=pantone) and compare what you see on your monitor to actual swatches of CMYK printed on coated stock. For the most telling result, use the guide as a reference and create some swatches in Photoshop (CMYK mode) using values from the guide. For relevance, pick colors from the Guide that are similar to the colors in your images.

My bet is that you’ll find your system in nowhere close to being in sync with your printer’s system. Guess which one will have to change? The fact that your unprofiled monitor and printer agree is a fluke and means nothing.
H
hpowen
Aug 26, 2005
BTW, a conversion from RGB to CMYK is not a standard "one size fits all" sort of thing. The conversion has to be done with a specific output device and a specific output media in mind. Each has its own characteristics and those characteristics are accounted for in a good color profile.

In order for Photoshop to make an accurate conversion, it has to map the colors from one space to another. Believe it or not, your monitor profile is a part of the process. Since you haven’t bothered to profile your monitor…
T
Tacit
Aug 26, 2005
In article ,
"mark4man" wrote:

1) First of all…what happened? The photos looked great in both Photoshop & Illustrator on my monitor as RGB’s. When I had converted in Photoshop, there was no difference at all in appearance. My working spaces in Photoshop are all default; & the photos look just like they do on my monitor when they print out in my project studio (on a typical HP Ink Jet.) I don’t mess around with Adobe Gamma or calibrating my monitor…

That’s the problem.

(because…the images on my system look exactly as they do in real life…

Your monitor is too light and too red. You are not seeing the pictures as they really are. You may think they look like "real life," but that may be because coincidence has entered the picture.

so, why calibrate the monitor to match the commercial
systems, which would make every image on my system dark & green…

Because for the purpose of reproducing something on a printing press, that commercial system IS real life. If you don’t match the offset proof, you don’t match real life.


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