convert pdf to imgs, then remove the watermark and convert them to pdf.

1. need to install poppler

on Mac, use:

brew install poppler

2. change the paths

open remove-watermark.py, and then change these to your own file/dir path

put the pdf file need to remove-watermark under the input_dir; and then create a output_dir to receive the pdf after converting; the most important, create a empty image dir to be the img_dir.

# source pdf path
input_dir = '/Users/frank/Code/Python/from'
# target pdf path
output_dir = '/Users/frank/Code/Python/to'
# temp image dir path
img_dir = '/Users/frank/Code/Python/temp'

Notice! img_dir must be a empty dir, because the code will delete all the jpg file under the img_dir after completing the conversion.

3. run the code