Output PDF is getting distorted on each ocrmypdf command.

Hi,

Please see the attached image where it shows the output PDF is getting distorted on each ocrmypdf command.

FYI, we are using auto-rotate options (–rotate-pages --rotate-pages-threshold 1) only for 1st version and for the rest versions PDF, we are not using the auto-rotate option.

sudo ocrmypdf --verbose 1 --force-ocr -l eng --output-type pdf --rotate-pages --rotate-pages-threshold 1 v_1.0.pdf v_1.1.pdf

sudo ocrmypdf --verbose 1 --force-ocr -l eng --output-type pdf v_1.1.pdf v_1.2.pdf

sudo ocrmypdf --verbose 1 --force-ocr -l eng --output-type pdf v_1.2.pdf v_1.3.pdf

sudo ocrmypdf --verbose 1 --force-ocr -l eng --output-type pdf v_1.3.pdf v_1.4.pdf

NOTE: OCRMyPDF version: 7.0.0

Could you please help me on this?

Also, if I add –oversample 600 option to command in each version, it works fine but output pdf size has increased.

sudo ocrmypdf --verbose 1 --force-ocr -l eng --output-type pdf --oversample 600 --rotate-pages --rotate-pages-threshold 1 v_2.0.pdf v_2.1.pdf

sudo ocrmypdf --verbose 1 --force-ocr -l eng --output-type pdf --oversample 600 v_2.1.pdf v_2.2.pdf

sudo ocrmypdf --verbose 1 --force-ocr -l eng --output-type pdf --oversample 600 v_2.2.pdf v_2.3.pdf

sudo ocrmypdf --verbose 1 --force-ocr -l eng --output-type pdf --oversample 600 v_2.3.pdf v_2.4.pdf
 

Thanks.

[jbarlow83]

Use --optimize 0 and --output-type pdf to disable and decompression.

Image resolution never changes by default but recompression can occur.

On Sun., Apr. 26, 2020, 13:30 Laurent Meyer, [e-mail] wrote:

Good evening,

I’m experiencing a similar problem but I have a conceptional question: why is OCRmyPDF changing the image output at all? I thought it would not be the case as I read it in the readme:

Keeps the exact resolution of the original embedded images

My case is the following: I have a long screenshot (webpage) that I cut in many pieces (via Pillow - loseless): after this operation the png is looking like this:

[image: image] https://user-images.githubusercontent.com/5024077/80318713-511c0f80-880c-11ea-8d0b-c30c1c887bde.png

After that, I convert it in PDF and the output looks the following:

[image: image] https://user-images.githubusercontent.com/5024077/80318734-698c2a00-880c-11ea-8a6e-440c6593b79b.png

And then I OCRmyPDF the file:

subprocess.run([“ocrmypdf”, “-l”, “eng+deu+fra”, “–threshold”, “…/pdfs/yourfile.pdf”, “…/pdfs/mvp.pdf”])

and I get some noise around the letters (it does the same without threshold):

[image: image] https://user-images.githubusercontent.com/5024077/80318756-97716e80-880c-11ea-9029-bb357fb3e672.png

Also the size of the pdf went from 2.3MB to 812KB but I would have preferred no compression at all…

I’m I missing something?

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/jbarlow83/OCRmyPDF/issues/316#issuecomment-619620464, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAN5YMYNRV3JPOPYYQMPC43ROSKXLANCNFSM4GGJNCTA .

[lolobosse]

Good evening,

I’m experiencing a similar problem but I have a conceptional question: why is OCRmyPDF changing the image output at all? I thought it would not be the case as I read it in the readme:

Keeps the exact resolution of the original embedded images

My case is the following: I have a long screenshot (webpage) that I cut in many pieces (via Pillow - loseless): after this operation the png is looking like this:

After that, I convert it in PDF and the output looks the following:

And then I OCRmyPDF the file:

subprocess.run(["ocrmypdf", "-l", "eng+deu+fra", "--threshold", "../pdfs/yourfile.pdf", "../pdfs/mvp.pdf"])

and I get some noise around the letters (it does the same without threshold):

Also the size of the pdf went from 2.3MB to 812KB but I would have preferred no compression at all…

I’m I missing something?