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Just a slow learner. Thanks for your enlightenment and patience! Thanks ...


Dec
16
awarded  Notable Question
Dec
14
awarded  Notable Question
Dec
7
comment How to tell if the hidden text layer in a pdf file is from OCR or not?
It is on topic, because it is about how to do that using applications running under Unix or Linux, not on other OSes.
Dec
7
asked How to tell if the hidden text layer in a pdf file is from OCR or not?
Dec
7
asked Resume a suspended process in a for loop
Dec
7
asked Avoid bloating file size when removing OCRed text from a pdf file?
Dec
7
comment How can I convert a scanned pdf with OCRed text to without OCRed text?
Thanks. I see. Is this problem related or not: I use pdfimages and convert on the pdf file with more than 1000 pages, and the size of the pdf file changes from 29MB to 373MB. I run pdftk ullman.pdf output new.pdf compress, and it doesn't reduce the file size. Is it possible to reduce the size in the middle of conversion, or is it better to do it after?
Dec
7
comment order for listing files
Thanks, It also adds a 0 infront of those with 4 digits already. Damage has been done. How can I revert those files original with 4 digits?
Dec
7
comment order for listing files
@muru:Thanks. How can i rename all the files so that they have four digits (padded with zeros) with the files given?
Dec
7
asked order for listing files
Dec
7
comment How can I convert a scanned pdf with OCRed text to without OCRed text?
I run pdfimages ullman.pdf tmp/ullman to convert a pdf file with more than 1000 pages to pbm files. A problem is that pdfimages only spare 3 digits for page numbers when naming the image files, e.g. ullman-099.pbm ullman-1000.pbm ullman-1001.pbm ullman-1002.pbm ullman-1003.pbm ullman-1004.pbm ullman-1005.pbm ullman-1006.pbm ullman-1007.pbm ullman-1008.pbm ullman-1009.pbm ullman-100.pbm ullman-1010.pbm. When running convert ullman*.pbm new.pdf", the pages in new.pdf` are disordered. Is there any way to ask pdfimages to spare 4 digits for page numbers when naming the pbm image files?
Dec
7
comment How can I convert a scanned pdf with OCRed text to without OCRed text?
Thanks. But if a pdf file instead of a dvi file is given?
Dec
7
comment How can I convert a scanned pdf with OCRed text to without OCRed text?
Yes, a pdf file with multiple images in one page doesn't come from scan, but it can come from LaTeX (using includegraphix multiple items to include several images will do the trick). For such a pdf file, is there a way to rasterize each page without losing quality as much as possible?
Dec
7
comment How can I convert a scanned pdf with OCRed text to without OCRed text?
Thanks. Just verified that. What if a pdf page contains more than one images? Will pdfimages output each image as a file? How can we rasterize each pdf page to a single image, regardless of how many images in the pdf page?
Dec
7
comment How can I convert a scanned pdf with OCRed text to without OCRed text?
Do the commands of pdfimages and convert not change the number of pixels along width and height, and not change the dpi?
Dec
7
revised How can I convert a scanned pdf with OCRed text to without OCRed text?
added 55 characters in body
Dec
7
comment How can I convert a scanned pdf with OCRed text to without OCRed text?
(1) THe OCR software I have doesn't remove existing OCRed text, and re-OCR will result in both old and new OCRed text. (2) In Windows, Adobe Pro doesn't re-OCR a pdf file with OCRed text.
Dec
7
comment How can I convert a scanned pdf with OCRed text to without OCRed text?
I don't have scanners, and am only given the scanned pdf file with OCRed text. (see the link to the file in my first sentence, and my attempt at the end of my post)
Dec
7
revised How can I convert a scanned pdf with OCRed text to without OCRed text?
added 380 characters in body
Dec
7
comment How can I convert a scanned pdf with OCRed text to without OCRed text?
Thanks. (1) I use the print to file in Evince, which I think uses cups-pdf, it doesn't remove OCRed text. (2) But can the ways of yours recover the original scanned pdf file before OCR as much as possible, without changing the width and height of each page in pixels, and without changing the PPI or DPI (pixels per inch) of each page?