pdfToImage (  int pdfPath , int _resolution[default:300] , string _imageDirectory  )  : list
Convert PDF into images. File names of images are at this format : 
	Return value
	Returns a list of paths of produced images.
	See also
ocr 
 partitionImage
        Example
        list imagePaths = pdfToImage(path("desktop")+"file.pdf", 200)
Parameters
pdfPath
 path of the PDF file to convert
							_resolution[default:300] (optional)
 resolution of images in DPI
							_imageDirectory (optional)
 Path of directory for images. By default it is the TMP folder.
							