[jira] [Created] (TIKA-4511) Detect compressed bmp

["Tim Allison (Jira)" <ji...@apache.org>]

Tim Allison created TIKA-4511:
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             Summary: Detect compressed bmp
                 Key: TIKA-4511
                 URL: https://issues.apache.org/jira/browse/TIKA-4511
             Project: Tika
          Issue Type: Task
            Reporter: Tim Allison


tesseract at least as recently as 5.4.1 with leptonica-1.82.0 cannot process compressed bmp. See: [https://github.com/tesseract-ocr/tesseract/issues/2558]

For OCR to work on these images, we'd have to use imagemagick or something similar to convert these to uncompressed bmp. As a first step, we'd need to detect compressed bmp vs uncompressed.

This ticket focuses solely on detection.

It looks like if the byte at 30 is non-zero, then we have a compressed bmp: [https://en.wikipedia.org/wiki/BMP_file_format]

 

I propose: {{image/bmp; compressed=true}}



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