Need to know how many pages contain color

Is there any way of determining from the PDF file how many pages contain color and how many are just black and white?
I need to be able to charge users for use of the more expensive color laser printer, and tell the relative cost of printing in black only.
If there is not a simple way, eg something in each page header, then how many different things would I need to scan for within the PDF file?
Has anyone else had this problem, and does anyone have any utilty software to help do this?
Cheers, Derek

Since this is the PDFLanguage forum, I'll answer by explain a bit about PDF...
In PDF, there are 11 different ways to represent a color. For example, "Black" could be represented in Gray (1.0), RGB ([0 0 0]), CMYK([0 0 0 1]), etc. Which one(s) of those are "black and white", in your definition?
Therefore, the first thing you need to do is understand how color works in PDF. Second, you need to understand how those varying colorspaces translate to your printer.
THEN you can look around at software solutions that will help you solve your needs.
Leonard

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