Created
June 18, 2015 09:21
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PDF to PNG and diff pdf using wand
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""" | |
Here I want to share a POC that make two things: | |
* Convert a multi page pdf to png files | |
* Make a diff file between page 1 and page 2 of the pdf | |
This is done using [wand librairy](http://wand-py.org). | |
""" | |
from wand.image import Image | |
def pdf2png_and_diff_p1_p2(source_file, target_file, diff_file): | |
RESOLUTION = 300 | |
with Image(filename=source_file, resolution=(RESOLUTION, RESOLUTION)) as img: | |
# Save one png file per page | |
img.save(filename=target_file) | |
# If there are at least 2 pages, compare page 1 with page 2 and save | |
# diff file | |
if len(img.sequence) > 1: | |
img_ref = img.sequence[0] | |
img_diff = img.sequence[1] | |
img_ref.composite_channel(channel='all_channels', | |
image=img_diff, | |
operator='difference') | |
with Image(width=img.width, height=img.height) as result: | |
result.composite_channel(channel='all_channels', | |
operator='add', image=img_ref) | |
result.format = 'png' | |
result.save(filename=diff_file) | |
return True | |
if __name__ == "__main__": | |
source_file = "/path_to/multi-pages.pdf" | |
target_file = "/path_to/output.png" | |
diff_file = "/path_to/diff_p1_p2.png" | |
pdf2png_and_diff_p1_p2(source_file, target_file, diff_file) |
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