convert extra-weird PDF image formats like JBIG2 to PNG
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@ -441,10 +441,18 @@ def is_single_image(page):
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blocks = page.get_text('blocks')
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return len(blocks) == 1 and blocks[0][6] == 1
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def extract_image(pdf, xref):
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image = pdf.extract_image(xref)
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if f'.{image["ext"]}' in IMAGE_FILE_EXTENSIONS:
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return image
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print(f'Converting image from {image["ext"]} to png')
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pix = fitz.Pixmap(pdf, xref)
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return { 'ext': 'png', 'image': pix.tobytes('png') }
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def pdf_images(pdf, force=False):
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images_by_page = [(page.get_images(), is_single_image(page)) for page in pdf]
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if all(len(images) == 1 and single for (images, single) in images_by_page):
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return (pdf.extract_image(images[0][0]) for (images, _) in images_by_page)
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return (extract_image(pdf, images[0][0]) for (images, _) in images_by_page)
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print("Checking PDF images the quick way failed, trying the slow way")
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def xref_or_image_generator():
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@ -456,7 +464,7 @@ def pdf_images(pdf, force=False):
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if xref_mode:
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yield xref
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else:
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yield pdf.extract_image(xref)
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yield extract_image(pdf, xref)
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else:
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if xref_mode:
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raise ValueError
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@ -476,7 +484,7 @@ def pdf_images(pdf, force=False):
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print('\nFailed')
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return None
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print('Success')
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return (pdf.extract_image(xref) for xref in xrefs)
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return (extract_image(pdf, xref) for xref in xrefs)
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def nfc(s):
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return unicodedata.normalize('NFC', s)
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