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From "Jukka Zitting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (TIKA-442) Image extractors use inconsistent metadata keys and formats for common features
Date Wed, 16 Jun 2010 21:42:24 GMT

    [ https://issues.apache.org/jira/browse/TIKA-442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879515#action_12879515
] 

Jukka Zitting commented on TIKA-442:
------------------------------------

I'd go with XMP as much as possible. XMP leverages Exif for image metadata, and the most relevant
fields are probably:

    tiff:ImageLength
    tiff:ImageWidth
    tiff:SamplesPerPixel
    tiff:BitsPerSample


> Image extractors use inconsistent metadata keys and formats for common features
> -------------------------------------------------------------------------------
>
>                 Key: TIKA-442
>                 URL: https://issues.apache.org/jira/browse/TIKA-442
>             Project: Tika
>          Issue Type: Improvement
>          Components: metadata, parser
>    Affects Versions: 0.7
>            Reporter: Nick Burch
>            Priority: Minor
>
> Currently Tika has a number of parsers for image formats, but the way they return their
data is inconsistent. For example:
> Jpeg: "Image Width" = "420 pixels", "Data Precision" = "8 bits"
> Gif: "width" = "420"
> Png: "width" = "420", "IHDR" = ".... bitDepth = 8 ....."
> Bmp: "width" = "420", "BitsPerSample" = "8 8 8"
> I think that the common keys, such as width and height, should be returned in a consistent
format of key and value. If someone would like to suggest the namespace for this (maybe under
XMDPM), and the short or long form (eg 420 vs 420 pixels), then I'm happy to work up a patch
for this

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