Dominik Schmidt created TIKA-4824:
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Summary: Extract embedded JPEG previews from Nikon NEF raw images
Key: TIKA-4824
URL: https://issues.apache.org/jira/browse/TIKA-4824
Project: Tika
Issue Type: New Feature
Reporter: Dominik Schmidt
NEF/NRW files are TIFF-based and embed a camera-generated full-resolution JPEG
preview (SubIFD0, JPEGInterchangeFormat/-Length). Tika currently has no access
to it: image/x-raw-nikon is glob-only and not a sub-class of image/tiff, no
parser claims the type, and nothing extracts the preview bytes. For consumers
that cannot decode raw sensor data, the embedded JPEG is the only practical way
to render a NEF (analogous to TIKA-4801 for audio cover art).
Proposal:
- New NEFParser in tika-parser-image-module: TIFF metadata via TiffParser,
walks IFD0 + SubIFDs and emits each JPEG preview through the
EmbeddedDocumentExtractor (image/jpeg, THUMBNAIL); configurable via
"nef-parser": {"extractPreviews": false}
- Add sub-class-of image/tiff to image/x-raw-nikon so name+data detection
resolves NEF
- Synthetic ~2KB test NEF mirroring the real IFD layout, unit and detection
tests
PR to follow.
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