drewnoakes/metadata-extractor

Support Canon CRW camera RAW format

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#2 创建于 2014年11月19日

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format-camera-rawhelp wanted

描述

The older CRW file format (superseded by CR2) is treated as a TIFF file, however it does not meet the library's expectations of TIFF files.

When TiffMetadataReader attempts to verify them, it falls over with ExifReader expecting 49492a but getting 49491a due to the difference in file format.

CRW data is stored as CIFF (Camera Image File Format) which is similar to TIFF, but differs.

Specifications at:

http://www.sno.phy.queensu.ca/~phil/exiftool/canon_raw.html

(Migrated from Google Code issue 42)

贡献者指南

技术栈
java
领域
backenddata
议题类型
feature
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
3
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3-5 days
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前置要求
Javaunderstanding of Exif/CIFF formatshexadecimal byte readingmetadata extractor codebase familiarity
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
25
研究方向
Examine how TiffMetadataReader processes files, then implement a new reader for CRW/CIFF format using the linked specifications. The CIFF header bytes differ (49491a vs 49492a). Create a new metadata reader class for CRW and integrate it into the metadata extraction pipeline. Test with sample CRW files.