How find Black & White of PDF page

Hi Andi,
I need to find color used in the PDF page. I need to isolate Black & White(Monochrome) PDF page from color PDF page.
I have found two methods, but both are very complicated & has less accuracy in identifying Black & White(Monochrome) PDF page.
1)Rendering PDF page to bitmap. And looping through the color of the bitmap. The Bitmap obtained after rendering have shades of gray color due to this black & white PDF page is identified as color pdf page.
2)Looping through the PDEElement of PDF page. Getting color space. Resolving color space to get RGB color value. This method is complicated as there too many colorspace which pdf supports. Getting RGB color value from all the color space is a difficult task.
It will be gr8 help if u suggest any simple method to identify Black & White PDF page in PDF document.

If you do not want to programm anything you can just use the plugin part of the itexttoolbox. Tools->Various->IdentifyColorPages.
For java webstart installation go to
http://itext.ugent.be/library/itext.jnlp
It uses the first approach you described.
Best regards

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