Identify and determine and count color, grayscale, black and white pages from PDF files

Do you have a tool that can be integrated into a net project and can identify if a PDF file has a page that is grayscale or color or black and white (monochrome)?

I want to count how may color pages, grayscale pages and black and white pages in a PDF file.

Customer
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"PDF to Image Converter COM/SDK" software has this function, you may download the trial version of "PDF to Image Converter COM/SDK" from following web page to try,

http://www.verypdf.com/app/pdf-to-image-converter/try-and-buy.html#buy-cvt-com
http://www.verypdf.com/pdf2tif/pdf2image_sdk_trial.zip

after you download it, you can use following C++ source code to identify color, grayscale, black and white pages from PDF file easily,

void main(int argc, char *argv[])
{
    if(argc != 2)
        return;
    char *lpPDFFile = argv[1];
    PDFToImageSetCode("XXXXXXXXXXXXXXXXXXXXXXX");
    int time1 = GetTickCount();
    int nPageCount = PDF2Image_GetPageCount(lpPDFFile);
    printf("PageCount = %d\n", nPageCount);
    for(int page = 0; page < nPageCount; page++)
    {
        int nColorType = PDF2Image_Is_Color_OR_Grayscale_Page(lpPDFFile, page+1);
        switch(nColorType)
        {
        case 1:
            printf("Page %d is a 'color' page.\n", page+1);
            break;
        case 2:
            printf("Page %d is a 'grayscale' page.\n", page+1);
            break;
        case 3:
            printf("Page %d is a 'black and white' page.\n", page+1);
            break;
        default:
            printf("Failed to retrieve color information from page %d.\n", page+1);
            break;
        }
    }
    int time2 = GetTickCount();
    printf("[Message] Used time = %d (%.2fs)\n", time2-time1, (time2-time1)/1000.0);
}

The trial pdf2image_sdk_trial.zip package contains a "pdf2img_is_color_grayscale_page.exe" application, you can run it in CMD window to determine Color & Grayscale & Black and White pages from PDF file easily, for example,

D:\VeryPDF>pdf2img_is_color_grayscale_page.exe test2.pdf
PageCount = 15
Page 1 is a 'color' page.
Page 2 is a 'color' page.
Page 3 is a 'black and white' page.
Page 4 is a 'color' page.
Page 5 is a 'black and white' page.
Page 6 is a 'black and white' page.
Page 7 is a 'black and white' page.
Page 8 is a 'color' page.
Page 9 is a 'color' page.
Page 10 is a 'black and white' page.
Page 11 is a 'black and white' page.
Page 12 is a 'color' page.
Page 13 is a 'black and white' page.
Page 14 is a 'black and white' page.
Page 15 is a 'black and white' page.
[Message] Used time = 9032 (9.03s)

image

btw, Spool File Page Counter SDK has this function too, you may download and test Spool File Page Counter SDK from following web page,

http://www.verydoc.com/spool-page-count.html

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