CMYK/RGB conversion

[Aronsson, Martin]

Hi again,

I'm glad it was of help to you Christiane. I double-checked here on my files again and when checking the black text elements in the Preflight tool Enfocus Pitstop, it is reported as (as you say) "Gray" with 0% "Brightness". Although when using the Output Preview advanced function in Acrobat 7 Pro itself, the same elements are reported as "Process Black 100%" (when holding the mouse pointer over those elements). I don't do any color conversion in the Distiller settings.

I don't know why it is reported with different names in the two tools (maybe someone else can explain this?), but I am almost sure it wont create any problems in the printing process anyway.

/Martin

> -----Original Message-----
> From: 
> framers-bounces+martin.aronsson=sonyericsson.com at lists.frameus
> ers.com 
> [mailto:framers-bounces+martin.aronsson=sonyericsson.com at lists
.frameusers.com] On Behalf Of Christiane Crety (CC)
> Sent: torsdag den 9 november 2006 09:28
> To: Aronsson, Martin; Framers at frameusers.com
> Subject: RE: CMYK/RGB conversion 
> 
> Thanks a lot, Martin! 
> You were right about my printer settings. I changed them and 
> it did make a difference. However, when I check the text 
> color, it is not defined as CMYK, but as "Grey 0%". Could it 
> be my Distiller settings that are not correct? Or is the 
> "Grey 0%" really the same as K=0? 
> I'm not exactly an expert on colors, as you may have noticed. 
> But I would really like to understand the basics, so that I 
> can get my settings right for the print shop.
> 
> Thanks again.
> 
> Christiane
> 
> 
> -----Original Message-----
> From: Aronsson, Martin [mailto:Martin.Aronsson at sonyericsson.com]
> Sent: 8. november 2006 11:53
> To: Christiane Crety (CC); Framers at frameusers.com
> Subject: RE: CMYK/RGB conversion 
> 
> Christiane,
> 
> I assume you use Windows and that you print your 
> Framemaker-book to PostScript via an installed PostScript printer.
> In Control Panel, right click the PostScript printer and 
> choose Properties -> Device Settings. Make sure "Convert Gray 
> Text to PostScript Gray" and "Convert Gray Graphics to 
> PostScript Gray" are set to Yes. If they were set to No, I 
> think this is what is causing the problem with your black 
> text getting converted to RGB. Changing it to Yes should 
> prevent this. I have those options set to Yes and black text 
> is correctly preserved as K=100% from Frame to PDF (while all 
> other use of colours in text-elements gets converted to RGB).
> 
> More info on this:
> "True gray" support options for both vector graphics and 
> text. Defaulted to "no" values, when set to "yes" the 
> "Convert Gray Text to PostScript Gray" and "Convert Gray 
> Graphics to PostScript Gray" assume that for all text and 
> vector graphics objects respectively, color values in which 
> the red (R), green (G), and blue (B) values match are really 
> an expression of grayscale as opposed to RGB color. The 
> default "no" results in those RGB values passed through to 
> the printer or Distiller as-is. The "yes" value can 
> dramatically improve output quality for black and grayscale 
> text and vector graphics for PostScript color printers that 
> do not automatically make assumptions about and convert R=G=B 
> values to K values. The "yes" value also assists in creating 
> prepress-friendly PostScript and PDF from applications that 
> do not generate their own PostScript (including Adobe 
> FrameMaker, Microsoft Office, and other popular office suite 
> and productivity programs). [I recommend that users always 
> set these values to "yes" - Dov.]
> Source: http://www.planetpdf.com/mainpage.asp?webpageid=1509
> 
> Good luck,
> /Martin
> 
> > -----Original Message-----
> > From: 
> > framers-bounces+martin.aronsson=sonyericsson.com at lists.frameus
> > ers.com
> > [mailto:framers-bounces+martin.aronsson=sonyericsson.com at lists
> .frameusers.com] On Behalf Of Christiane Crety (CC)
> > Sent: tisdag den 7 november 2006 16:08
> > To: Framers at frameusers.com
> > Subject: CMYK/RGB conversion
> > 
> > Hi Framers,
> > 
> > Using FM 7.2 and Distiller 7.0 to create pdf for print.
> > I have some trouble trying to figure out how to cope with 
> the "convert 
> > to RGB" problem with FrameMaker.
> > When I generate pdf files from FrameMaker, some of the colors are 
> > converted to RGB.
> > If I select the Distiller option "Convert all colors to CMYK" 
> > I avoid the RGB, but the colors are not defined the way 
> they were in 
> > FM. For example, my black text is C=0%, M=0%, Y=0%, K=100% in 
> > FrameMaker, but C=74.9%, M=67.8%, Y=67.1% and K=90.2% in 
> the pdf file.
> > 
> > I know there are also tools that can convert to CMYK after creating 
> > the pdf file, but I would really prefer it if the Distiller 
> could take 
> > care of it...
> > 
> > Does anyone know how to keep the original CMYK values in the pdf 
> > output? I'm pulling my hair out....
> > 
> > Thanks in advance!
> > 
> > 
> > Christiane Crety
> > Technical Writer
> > 
> > T + 45 39 55 86 82
> > E cc at thrane.com
> > 
> > Thrane & Thrane A/S - Lundtoftegaardsvej 93D DK-2800  Kgs. 
> > Lyngby, Denmark - www.thrane.com T +45 39 55 88 00 - F + 45
> > 39 55 88 88