Prepressforums.com

thermol · #1 (**permalink**) 11-20-2005, 01:51 AM

Customer give me a file PDF (128page) but all image in all page is RGB mode color. I used Action list (convert to CMYK) -> all image are very bad.

Can you tell me methols to convert all RGB Image in PDF file but Image's COLOR NO CHANGE ?

I use:Pistop 6.01, Acrobat 6.0

Thank you for any help possible! :lol:

NutCase · #2 (**permalink**) 11-20-2005, 08:30 AM

Check out this site http://www.mattbeals.com/cms/

Pay particular attention to the second page where you setup color management in acrobat and pitstop. Try that and then run the convert to cmyk action list again on the original PDF with the RGB images (not the one you converted already).

Depending on the colors in the original RGB stuff, you may or may not see a change in color when you convert to CMYK.

thermol · #3 (**permalink**) 11-20-2005, 11:14 PM

I try demo QUITE A BOX OF TRICKS and the result is best. All RGB image auto convert to CMYK with good quality.
But someone tell me how to use ACTION LIST of pitstop so give ICC Profile (*.ICC file ) for RGB Image.
Thank alot. :lol:

NutCase · #4 (**permalink**) 11-21-2005, 05:00 AM

If you want to tag the images in your document, see if you have an action list called Tag Images with ICC. If you edit that action list, you can set the profiles you want. Not sure if it's there in your version of acrobat but maybe you can download it from the enfocus web site. This won't convert the colors though, just tag with profiles.

I've tried quite a box of tricks for converting RGB to CMYK and the results were basically the same as Pitstop. If I left quite a box of tricks with the defaults, the results were terrible. If I selected the ColorSync option and put in the profiles I wanted, the results were good. The exact same thing happens with Pitstop when converting color if you don't set your profiles properly.

mattbeals · #5 (**permalink**) 11-21-2005, 07:30 AM

action list:

select images
select colorspace - device RGB (or ICC tagged or what-ever)
AND
convert color - CMYK

Make sure that you have color management activated and configured with the right source RGB profile and correct target CMYK Profile.

thermol · #6 (**permalink**) 11-22-2005, 07:08 AM

Thank you very much.

I have tried and the result is very good.
But I don't know what's the best ICC profile to tag for RGB image?
Any body tell me "Euro Scale K85 icc profile is the best"?
Everyone have any think ? :lol:

mattbeals · #7 (**permalink**) 11-22-2005, 07:19 AM

There is not "best ICC profile". There is the profile that belongs to the images. If it is a screen shot from Windows, a digital camera image, from Microsoft Office then it's 99.999999% chance going to be sRGB. If it is from a Mac (Quartz) Calibrated RGB. But the images should be tagged and have those profiles brought along into the PDF.

AdobeRGB is the "standard" in PRE Creative Suite/Photoshop. Lately it's been sRGB (even though it's a bit more blue).

Like I said, there's no "best profile". There's only the profile that belongs to to the capture device that is supposed to be attached by default. You can always convert RGB to RGB if you like.

thermol · #8 (**permalink**) 11-22-2005, 07:10 PM

I've try color managerment and result is best.
But try to do follow you:
action list:

select images
select colorspace - device RGB (or ICC tagged or what-ever)
AND
convert color - CMYK

Quote:

and image with RGB mode convert to CMYK with bad result.
I don't known why. Can I send you your PDF file?
Tell me step and step to make action list to convert all RGB mage to CMYK with best result.
Thank a lot. Have a good time. :lol:

mattbeals · #9 (**permalink**) 11-22-2005, 08:20 PM

Is there an echo in here?