Python Image Library convert from Jpeg to PDF

问题:

I'm attempting to convert a Jpeg file with, 200 dpi, to a PDF file, however, when I save the file as a PDF I think it's changing the dpi to 72, and thus making the image larger. I had a similar problem when initially trying to scale my jpeg image to a smaller size, and was able to solve that by specifying the dpi when I save the image.

im = Image.open("Image.jpg")  dpi=im.info['dpi']  if im.size == (2592, 1728):     out = im.resize((1188,792), Image.ANTIALIAS) elif im.size == (1728,2592):     out = im.resize((792,1188), Image.ANTIALIAS)  out.save(project, dpi=dpi) 

Now when I try to save this jpeg as a PDF, specifying the dpi doesn't seem to make any diffrence, and I get an image that is larger than my original that looks like it has a lower dpi. Is there a way to mantain a consistent resolution when converting from Jpeg to PDF using PIL? Or is there a better way for me to go about doing this?

This is what I have for converting a directory of files from jpeg to pdf:

for infile in listing:      outfile = destpath + os.path.splitext(infile)[0] + ".pdf"     current = path + infile      if infile != outfile:         im = Image.open(current)         dpi=im.info['dpi']          im.save(outfile, "PDF", Quality = 100) 

Thanks for any help!

回答1:

In the CHANGES file of PIL 1.1.7 sources one can read:

• Added resolution save option for PDF files.

  Andreas Kostyrka writes: I've included a patched PdfImagePlugin.py
  based on 1.1.6 as included in Ubuntu, that supports a "resolution"
  save option. Not great, but it makes the PDF saving more useful by
  allowing PDFs that are not exactly 72dpi.

So you should be able to do:

im.save(outfile, "PDF", resolution=100.0) 

(seems to work fine on my Ubuntu box).

回答2:

You can use reportlab library.

import sys  from reportlab.lib.pagesizes import letter from reportlab.platypus import SimpleDocTemplate, flowables  __jpgname = str() def drawPageFrame(canvas, doc):     width, height = letter     canvas.saveState()     canvas.drawImage(     __jpgname, 0, 0, height, width,     preserveAspectRatio=True, anchor='c')     canvas.restoreState()  def jpg2pdf(pdfname):     width, height = letter      # To make it landscape, pagesize is reversed     # You can modify the code to add PDF metadata if you want     doc = SimpleDocTemplate(pdfname, pagesize=(height, width))     elem = []      elem.append(flowables.Macro('canvas.saveState()'))     elem.append(flowables.Macro('canvas.restoreState()'))      doc.build(elem, onFirstPage=drawPageFrame)  if __name__ == '__main__':     if len(sys.argv) < 3:     print("Usage: python jpg2pdf.py <jpgname> <pdfname>")     exit(1)     __jpgname = sys.argv[1]     jpg2pdf(sys.argv[2]) 

回答3:

It is important that PIL parameters are lowercase.

im.save(outfile, "PDF", quality = 100)

Quality = 100 ----will not work.

回答4:

Here is a code that convert any file with .jpg or .JPG extension and convert into pdf, and then delete the images that have been converted. Sorry the comments are in french.

import os #necessaire pouvoir supprimer l'image une fois converti et parcourir les fichers dans le dossier from fpdf import FPDF #necessaire pour convertir les jpg en pdf   for file in os.listdir(): # pour chaque fichiers dans le dossier dans lequel se trouve ce fichier python if file.endswith(".jpg") or file.endswith(".JPG"): #permet de selectionner les fichers avec l'extension .jpg ou .JPG     img=os.path.join(file) #convertie le nom du fichier en variable     pdf = FPDF()     pdf.add_page()     pdf.set_font('Arial', 'B', 16)     pdf.image('%s'%img, 3,3,204 ) # les chiffres permettent de positionner l'image sur le pdf : 3mm de la gauche, 3mm du haut, et 204 mm de la gauche pour la fin de l'image     img2=img[:-4] #supprime les 4 dernières lettres du nom du ficher, à savoir '.jpg' ou '.JPG'     pdf.output('%s.pdf'%img2,'F') #convertie en pdf     os.remove('%s'%img) #supprime les fichier jpg ou JPG 

回答5:

You might need to use:

import PIL import PIL.Image  filename = 'filename' im = PIL.Image.open(filename)  newfilename = 'path.pdf' PIL.Image.Image.save(newfilename,outfile, "PDF", resoultion = 100.0) 

I'm using windows and I used pip to install PIL. For some reason it switched to PIL.Image.Image

回答6:

The correct usage of save is:

PIL.Image.Image.save(im, newfilename, "PDF", resolution = 100.0) 

example:

path='v:/dev/python/mooc/' filename = path + '2016_a_milano_001.JPG' im = PIL.Image.open(filename) newfilename = path+ 'r.pdf' PIL.Image.Image.save(im, newfilename, "PDF", resoultion=100.0) 

回答7:

A complete example here:

import os import PIL.Image  def img2pdf(fname):     filename = fname     name = filename.split('.')[0]     im = PIL.Image.open(filename)     if not os.path.exists('im2pdf_output'):         os.makedirs('im2pdf_output')     newfilename = ''.join(['im2pdf_output/',name,'.pdf'])     PIL.Image.Image.save(im, newfilename, "PDF", resolution = 100.0)     print("processed successfully: {}".format(newfilename))  files = [f for f in os.listdir('./') if f.endswith('.jpg')] for fname in files:     img2pdf(fname) 

文章来源: Python Image Library convert from Jpeg to PDF