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Trenton HandClaude Sonnet 5.5
c089bba32c
* Mark the thumbnail constants Final * Comment each pdftoppm option * Feature/Chore: Replaces all usages of ImageMagik's convert binary with a simple Pillow based helper This removes ImageMagik as a dependency entirly and all documentation is cleaned up from it. We no longer need to install it, have a policy for it to allow PDFs and no longer shell out to it either. * Fix: Save WebP images losslessly when removing the alpha channel Pillow's default WebP save is lossy, so a WebP with an alpha channel came back from remove_alpha_channel with slightly shifted pixel values before it reached OCR. Save WebP lossless; other formats are unchanged. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>
42 lines
1.3 KiB
Python
42 lines
1.3 KiB
Python
from pathlib import Path
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import img2pdf
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from PIL import Image
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from documents.utils import copy_basic_file_stats
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from documents.utils import maybe_override_pixel_limit
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from documents.utils import remove_alpha_channel
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def convert_from_tiff_to_pdf(tiff_path: Path, target_directory: Path) -> Path:
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"""
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Converts a TIFF file into a PDF file.
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The PDF will be created in the given target_directory and share the name of
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the original TIFF file, as well as its stats (mtime etc.).
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Returns the path of the PDF created.
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"""
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# override pixel setting if needed
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maybe_override_pixel_limit()
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with Image.open(tiff_path) as im:
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has_alpha_layer = im.mode in ("RGBA", "LA")
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if has_alpha_layer:
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# Note the save into the temp folder, so as not to trigger a new
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# consume
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scratch_image = target_directory / tiff_path.name
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remove_alpha_channel(tiff_path, scratch_image)
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else:
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# Not modifying the original, safe to use in place
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scratch_image = tiff_path
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pdf_path = (target_directory / tiff_path.name).with_suffix(".pdf")
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with scratch_image.open("rb") as img_file, pdf_path.open("wb") as pdf_file:
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pdf_file.write(img2pdf.convert(img_file))
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# Copy what file stat is possible
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copy_basic_file_stats(tiff_path, pdf_path)
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return pdf_path
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