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

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

     [ https://issues.apache.org/jira/browse/TIKA-4511?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Allison resolved TIKA-4511.
-------------------------------
    Fix Version/s: 4.0.0
                   3.3.0
       Resolution: Fixed

Please reopen if the non-zero value at byte 30 is not precise/general enough.

> Detect compressed bmp
> ---------------------
>
>                 Key: TIKA-4511
>                 URL: https://issues.apache.org/jira/browse/TIKA-4511
>             Project: Tika
>          Issue Type: Task
>            Reporter: Tim Allison
>            Priority: Trivial
>             Fix For: 4.0.0, 3.3.0
>
>
> 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;format=compressed}}



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