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Improved output quality

This commit is contained in:
Sayantan Santra 2023-02-22 18:23:22 -06:00
parent 43aaa2c8c0
commit 769cc7b0ee
1 changed files with 8 additions and 4 deletions
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12
convert-for-office-printer.py
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@ -34,10 +34,11 @@ if page_size not in ["a4", "letter"]:
raise Exception( raise Exception(
'Unknown paper size! Only supported sizes are A4 and Letter.') 'Unknown paper size! Only supported sizes are A4 and Letter.')
pdf = convert_from_path(filename) pdf = convert_from_path(filename, dpi=300)
a4size = int(8.27*300), int(11.7*300) dpi = 300
lettersize = int(8.5*300), int(11*300) a4size = int(8.27*dpi), int(11.7*dpi)
lettersize = int(8.5*dpi), int(11*dpi)
if page_size == "a4": if page_size == "a4":
new_size = a4size new_size = a4size
@ -49,12 +50,15 @@ pagenum = len(pdf)
new_pdf = list() new_pdf = list()
for i in range(pagenum): for i in range(pagenum):
page = Image.new('L', new_size, 'white') # The '1' means black and white page = Image.new('L', new_size, 'white') # The '1' means black and white
old_size = pdf[i].size old_size = pdf[i].size
ratio = min(new_size[0]/old_size[0], new_size[1]/old_size[1]) ratio = min(new_size[0]/old_size[0], new_size[1]/old_size[1])
resize_to = round(old_size[0]*ratio), round(old_size[1]*ratio) resize_to = round(old_size[0]*ratio), round(old_size[1]*ratio)
offset = round((new_size[0]-resize_to[0]) / offset = round((new_size[0]-resize_to[0]) /
2), round((new_size[1]-resize_to[1])/2) 2), round((new_size[1]-resize_to[1])/2)
page.paste(pdf[i].resize(resize_to, Image.LANCZOS), offset) page.paste(pdf[i].resize(resize_to, Image.LANCZOS), offset)
# We apply a curve to deepen the previously colored strokes
page_bw = page.point(lambda x: round(x/12) if 16 < x < 192 else x, 'L') page_bw = page.point(lambda x: round(x/12) if 16 < x < 192 else x, 'L')
new_pdf.append(page_bw) new_pdf.append(page_bw)
@ -64,6 +68,6 @@ if os.path.isfile(new_filename) and overwrite_status != '-o':
raise Exception( raise Exception(
'File '+new_filename+' is already present. Add -o at the end to overwrite') 'File '+new_filename+' is already present. Add -o at the end to overwrite')
new_pdf[0].save(new_filename, "PDF", quality=100, new_pdf[0].save(new_filename, "PDF", resolution=dpi, quality=100,
save_all=True, append_images=new_pdf[1:]) save_all=True, append_images=new_pdf[1:])
print('File '+new_filename+' was created.') print('File '+new_filename+' was created.')