fix: preserve image EXIF orientation and PDF /Rotate through compression#154
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Ghostscript's pdfwrite device silently strips /Rotate page attributes, leaving scanned PDFs displayed upside-down after compression. Pillow similarly drops EXIF Orientation when re-saving, rotating scanned images. file_processing.py: - Add ImageOps.exif_transpose() after Image.open() in both compress_image_upload and compress_image_inplace so scanner EXIF orientation is baked into pixels before the tag is stripped - compress_image_inplace now also detects orientation-only fixes so small files below the skip threshold are still corrected - Add _read_page_rotations() / _restore_page_rotations() helpers that snapshot page /Rotate values before Ghostscript and write them back into the output via pypdf; wired into both _compress_pdf_bytes (upload path) and compress_pdf_inplace (management command path) compress_media.py: - --force flag: bypass image size threshold (remediate already-compressed images with lost EXIF orientation) - --rotate-pages DEGREES flag: set /Rotate on every page of all PDFs under --path; accepts both a directory and a single file path (remediate PDFs whose rotation metadata was already stripped) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
pdfwritedevice silently strips/Rotatepage attributes from PDFs; Pillow drops the EXIFOrientationtag when re-saving images. Both compression paths (upload-time andcompress_mediamanagement command) were affected, leaving scanned documents displayed upside-down._read_page_rotations()/_restore_page_rotations()helpers that snapshot page/Rotatevalues before Ghostscript runs and write them back into the output via pypdf. Wired into both_compress_pdf_bytes(upload path) andcompress_pdf_inplace(management command).ImageOps.exif_transpose()afterImage.open()in bothcompress_image_uploadandcompress_image_inplaceso scanner EXIF orientation is baked into pixels before the tag is stripped on re-save.compress_mediamanagement command:--force: bypass image size threshold to reprocess already-compressed images (fixes lost EXIF orientation)--rotate-pages DEGREES [--path <file-or-dir>]: set/Rotateon every page of matching PDFs; accepts a single file or a directory (fixes PDFs whose rotation metadata was already stripped)Test plan
compress_image_inplace--rotate-pages 180 --path clients/ml, generated PDF individually corrected via--rotate-pages 0 --path clients/ml/2026/<file>.pdf🤖 Generated with Claude Code