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Downsize scanned PDF files for low space
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| # find the number of pages in pdf file | |
| qpdf --show-npages file_name.pdf | |
| # split into multiple pages using first-to-last range, where first page is 1 and last page is 4 | |
| pdftoppm -jpeg -f 1 -l 4 some-file.pdf p | |
| # combine into single pdf | |
| convert p-1.jpg p-2.jpg p-3.jpg p-4.jpg some-file-downsized.pdf |
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