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The new Preflight module built into Acrobat 6.0 Professional (as well as its sibling pdfInspektor2 from callas software) will list for every page on how many pages it is going to put marks. The underlying assumption is that the process color model is CMYK, i.e. Device RGB as well as any calibrated color spaces (ICC based, Lab, CalGray, CalRGB) are considered to always image on all four CMYK plates. With regard to DeviceMYK the decision is made based on the tint values used in each channel. DeviceGray and Separation Black are considered to print on the Black plate only. "All" (registration color) never prints a plate by itself. Images are considered to use all of their color channels (even if for example you have a DeviceCYMK image that only happens to use values other than zero on the black channel). And finally - the Black plate is considered to be used as soon as any object in DeviceGray, DeviceRGB, DeviceCMYK, calibrated color spaces and All is used, even if any such objects happens to paint only 'white'. This works very well for practical use in prepress towards all the common printing processes (which usually follow he CMYK process color model, plus spot colors, whether on their own, in conjunction with a Black plate, or with all 4 CMYK plates). When dealing with RGB oriented files or devices, this may fail to report that a page is pretty much black only. But then, on RGB devices you do not have a black plate or separation anyway. If it is relevant to deal with RGB files with regard to differentiating between black only pages as opposed to pages 'really' using color, the best approach is to use color RGB conversion features in Quite A Box Of Tricks (www.quite.com), SuperColor (www.heidelberg.com) or PDFenhancer (www.apago.com). These tools have options to convert RGB to Black/grayscale if the values for R, G and B are equal (does not apply though to pixels inside an image). Olaf Druemmer PS: You could even use the free "PDF/X-3 Inspector (Freeware)" - see www.pdfx.info for a download - to find out the same information. [EMAIL PROTECTED] wrote Fri, 10 Oct 2003 07:46:32 -0400 >At 2:18 PM +1000 10/10/03, John Weichard wrote: >>Does anyone know of an application that will interrogate a multi >>page PDF and report on the number of colour and B&W pages contained >>in the document? >> > > There are programs that can tell you about the colors being >used, but not specifically if a page is "color" vs "B&W" since the >definition of each isn't as cut and dried in publishing. > > For example, if the PDF specifies "black" in RGB or CMYK - is >that Black to you? What about the spot color "All" - is that White? > > >Leonard To change your subscription: http://www.pdfzone.com/discussions/lists-pdf.html
