'Declaration

Public MustOverride ReadOnly Property BitsPerPixel As System.Int32

public abstract System.Int32 BitsPerPixel { get; }

public: __property abstract System.Int32 get_BitsPerPixel();

public:
abstract property System.Int32 BitsPerPixel {
   System.Int32 get();
}

For 1-bpp black-white image this value will return 1.
For 2-bpp palette/gray image this value will return 8 because image page will be returned as 8-bpp palette/gray image.
For 4-bpp palette/gray image this value will return 8 because image page will be returned as 8-bpp palette/gray image.
For 8-bpp palette/gray image this value will return 8.
For 24-bpp RGB image this value will return 24.
For 32-bpp ARGB image this value will return 32.
For 48-bpp RGB image this value will return 48.
For 64-bpp ARGB image this value will return 64.
For 32-bpp CMYK image this value will return 24 because image page will be returned as 24-bpp RGB image.