It will return result_flag as True if the images match and False if they do not. The below method would help you achieve this. Now we can use the ImageChops.difference() method to compare the images from the list of images created. Compare corresponding images and save the resulting difference image for every page Print('Finished calling convert on %s'%src) Print('Total of %d jpgs produced after converting the pdf file: %s'%(len(image_list),pdf_file)) #Get all the jpg files after calling convert and store it in a list Pdf_name = pdf_file.split(os.sep).split('.pdf') could be an ImageMagick bug' ) print (e ) print ( 'Finished calling convert on %s'%src )ĭef get_image_list_from_pdf(self,pdf_file): check_call (, shell = True ) except Exception ,e: "Call convert to convert pdf to jpg" print ( 'About to call convert on %s'%src ) try: append (f ) print ( 'Total of %d jpgs produced after converting the pdf file: %s'% ( len (image_list ) ,pdf_file ) ) return image_list #Make sure the file names of both pdf are not similar call_convert (pdf_file ,jpg ) #Get all the jpg files after calling convert and store it in a listįile_list = os. split ( '.pdf' ) + '.jpg' # Convert the pdf file to jpg file self. "Return a list of images that resulted from running convert on a given pdf" To do so, we will call convert from Python using the subprocess module.ĭef get_image_list_from_pdf ( self ,pdf_file ): So we first have to convert the PDF into a list of images. However we can’t use it directly on a PDF file. We plan to use the difference method in Imagechops module which returns the absolute value of the difference between the two images. Convert each page of the PDF file into one image Open a command prompt and run the command ‘convert file.pdf file.jpg’ to convert file.pdf into a file.jpg. Verify you are setup correctly by using the “convert” utility. Add both ImageMagick and GhostScript to your path environment variable.ĭ. ImageMagick needs Ghostscript which is an interpreter for the PostScript language and for PDF.Ĭ. Download and install ImageMagick which is a software suite to create, edit, compose, or convert bitmap imagesī. We will use ImageMagick, which in turn uses Ghostscript. The first step is to convert the PDF file to a different format like jpg. Get setup with ImageMagick and Ghostscript Below few steps will explain the different methods and modules which are required to compare two PDF files. The class will help you compare two PDF files, list out which pages differ and give you a overlaid images of the two PDF files. I have created a class PDF_Image_Compare which can be used to compare two PDFs. Stitch all the resulting difference images into a single PDF fileĥ. Compare corresponding images and save the resulting difference image for every pageĤ. Convert each page of the PDF file into one imageģ. Get setup with ImageMagick and GhostscriptĢ. We will be using image comparison to verify if the two PDF files are identical or not. Ask your developers for other ways to check the data/content of the PDF files before using this approach. WARNING: You should be using this kind of automated check as a last resort. In this post, we show you one more approach which is useful if you have a lot of graphs and charts in your PDF files. However we noticed that they are somewhat lacking when it comes to comparing graphs and charts. Most of these solutions do a good job of comparing the text in the PDF files. Each option comes with its own set of pros and cons. We like DiffPDF, pdf2text, the pdf-diff python module. In these cases, it helps to have a script that can compare PDF files and tell you if they differ in any way. However as testers, we sometimes need to compare a lot of PDF files (especially reports!) against some preset baselines. Problem:How do you compare two PDF files programmatically using Python?Īdobe makes it easy to compare the changes in two PDF files.
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