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