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converting pdf to image but after zooming in

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5

This link shows how pdfs could be converted to images. Is there a way to zoom my pdfs before converting to images? In my project, i am converting pdfs to pngs and then using Python-tesseract library to extract text. I noticed that if I zoom pdfs and then save parts as pngs then OCR provides much better results. So is there a way to zoom pdfs before converting to pngs?

image pdf ocr python-tesseract poppler

share|improve this question

asked Mar 22 at 17:58

user2543622user2543622

1,090144283

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can also create a High resolution image from PDF and crop the image section which you need to OCR.
  
  – flamelite
  Mar 27 at 13:16
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  could you show how to do that? I need to do OCR on the whole page
  
  – user2543622
  Mar 27 at 14:51
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  could you provide some pdf examples?
  
  – Liam
  Mar 28 at 17:44
  

  
  
  
  

add a comment | 

5

This link shows how pdfs could be converted to images. Is there a way to zoom my pdfs before converting to images? In my project, i am converting pdfs to pngs and then using Python-tesseract library to extract text. I noticed that if I zoom pdfs and then save parts as pngs then OCR provides much better results. So is there a way to zoom pdfs before converting to pngs?

image pdf ocr python-tesseract poppler

share|improve this question

asked Mar 22 at 17:58

user2543622user2543622

1,090144283

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can also create a High resolution image from PDF and crop the image section which you need to OCR.
  
  – flamelite
  Mar 27 at 13:16
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  could you show how to do that? I need to do OCR on the whole page
  
  – user2543622
  Mar 27 at 14:51
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  could you provide some pdf examples?
  
  – Liam
  Mar 28 at 17:44
  

  
  
  
  

add a comment | 

This link shows how pdfs could be converted to images. Is there a way to zoom my pdfs before converting to images? In my project, i am converting pdfs to pngs and then using Python-tesseract library to extract text. I noticed that if I zoom pdfs and then save parts as pngs then OCR provides much better results. So is there a way to zoom pdfs before converting to pngs?

image pdf ocr python-tesseract poppler

share|improve this question

asked Mar 22 at 17:58

user2543622user2543622

1,090144283

share|improve this question

asked Mar 22 at 17:58

user2543622user2543622

1,090144283

share|improve this question

asked Mar 22 at 17:58

user2543622user2543622

1,090144283

asked Mar 22 at 17:58

user2543622user2543622

1,090144283

asked Mar 22 at 17:58

user2543622user2543622

1,090144283

1 Answer
1

active

oldest

votes

6

+50

I think that raising the quality (resolution) of your image is a better solution than zooming into the pdf.

using pdf2image you can accomplish this quite easily:

install pdf2image: pip install pdf2image

then, in python, convert your pdf into a high quality image:

from pdf2image import convert_from_path

pages = convert_from_path('sample.pdf', 400) //400 is the Image quality in DPI (default 200)

pages[0].save("sample.png")

by playing around with the quality parameter you should get the result you desider

share|improve this answer

answered Mar 28 at 17:48

LiamLiam

2,61121838

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  any idea how high we could go on DPI? please provide a documentation link. I tried python help but it was that useful
  
  – user2543622
  Mar 28 at 23:32
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @user2543622 it depends on the pdf you are working on and your computer memory, here is the wikipedia link for dpi:en.wikipedia.org/wiki/Dots_per_inch
  
  – Liam
  Mar 29 at 19:46
  

  
  
  
  

add a comment | 

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6

+50

I think that raising the quality (resolution) of your image is a better solution than zooming into the pdf.

using pdf2image you can accomplish this quite easily:

install pdf2image: pip install pdf2image

then, in python, convert your pdf into a high quality image:

from pdf2image import convert_from_path

pages = convert_from_path('sample.pdf', 400) //400 is the Image quality in DPI (default 200)

pages[0].save("sample.png")

by playing around with the quality parameter you should get the result you desider

share|improve this answer

answered Mar 28 at 17:48

LiamLiam

2,61121838

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  any idea how high we could go on DPI? please provide a documentation link. I tried python help but it was that useful
  
  – user2543622
  Mar 28 at 23:32
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @user2543622 it depends on the pdf you are working on and your computer memory, here is the wikipedia link for dpi:en.wikipedia.org/wiki/Dots_per_inch
  
  – Liam
  Mar 29 at 19:46
  

  
  
  
  

add a comment | 

6

+50

I think that raising the quality (resolution) of your image is a better solution than zooming into the pdf.

using pdf2image you can accomplish this quite easily:

install pdf2image: pip install pdf2image

then, in python, convert your pdf into a high quality image:

from pdf2image import convert_from_path

pages = convert_from_path('sample.pdf', 400) //400 is the Image quality in DPI (default 200)

pages[0].save("sample.png")

by playing around with the quality parameter you should get the result you desider

share|improve this answer

answered Mar 28 at 17:48

LiamLiam

2,61121838

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  any idea how high we could go on DPI? please provide a documentation link. I tried python help but it was that useful
  
  – user2543622
  Mar 28 at 23:32
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @user2543622 it depends on the pdf you are working on and your computer memory, here is the wikipedia link for dpi:en.wikipedia.org/wiki/Dots_per_inch
  
  – Liam
  Mar 29 at 19:46
  

  
  
  
  

add a comment | 

I think that raising the quality (resolution) of your image is a better solution than zooming into the pdf.

using pdf2image you can accomplish this quite easily:

install pdf2image: pip install pdf2image

then, in python, convert your pdf into a high quality image:

from pdf2image import convert_from_path

pages = convert_from_path('sample.pdf', 400) //400 is the Image quality in DPI (default 200)

pages[0].save("sample.png")

by playing around with the quality parameter you should get the result you desider

share|improve this answer

answered Mar 28 at 17:48

LiamLiam

2,61121838

from pdf2image import convert_from_path

pages = convert_from_path('sample.pdf', 400) //400 is the Image quality in DPI (default 200)

pages[0].save("sample.png")

share|improve this answer

answered Mar 28 at 17:48

LiamLiam

2,61121838

answered Mar 28 at 17:48

LiamLiam

2,61121838

answered Mar 28 at 17:48

LiamLiam

2,61121838