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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TIKA-2630) Wrong height and width metadata for JPEG images
Date Tue, 30 Oct 2018 15:04:00 GMT

    [ https://issues.apache.org/jira/browse/TIKA-2630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16668839#comment-16668839
] 

ASF GitHub Bot commented on TIKA-2630:
--------------------------------------

tballison commented on issue #255: TIKA-2630: Wrong height and width metadata for JPEG images
URL: https://github.com/apache/tika/pull/255#issuecomment-434337083
 
 
   I don't know enough about exif to be useful on this.  If there are only a few standard
directories (say, ExifSubIFDDirectory or ExifIFD0Descriptor), could we make those static property
prefixes or static properties?  Given that I don't know what we'll find in exif, I'm very
hesitant about using the literal directory name.  If we do go with the literal directory name
in some cases, we should prefix that.  WDYT?

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> Wrong height and width metadata for JPEG images
> -----------------------------------------------
>
>                 Key: TIKA-2630
>                 URL: https://issues.apache.org/jira/browse/TIKA-2630
>             Project: Tika
>          Issue Type: Bug
>          Components: parser
>    Affects Versions: 1.17
>            Reporter: Ancuta Morarasu
>            Assignee: Dave Meikle
>            Priority: Major
>         Attachments: Tika-metadata.txt, metadata-exctractor-metadata.txt, sizesampleissue.jpg
>
>
> According to [Exif specs|http://www.exif.org/Exif2-2.PDF#page=73&zoom=auto,-176,103],
for compressed images the values for width and height should come from the tags:
> * *PixelXDimension* mapped in metadata-extractor to {{com.drew.metadata.Directory.ExifDirectoryBase.TAG_EXIF_IMAGE_WIDTH}}
and
> * *PixelYDimension* mapped to {{ExifDirectoryBase.TAG_EXIF_IMAGE_HEIGHT}}.
> {{ImageMetadataExtractor$ExifHandler.[handlePhotoTags(...)|https://github.com/apache/tika/blob/master/tika-parsers/src/main/java/org/apache/tika/parser/image/ImageMetadataExtractor.java#L487]}}
should extract and set these in the metadata:
> {code:java}
>  if (directory.containsTag(ExifSubIFDDirectory.TAG_EXIF_IMAGE_WIDTH)) {
>     metadata.set(Metadata.IMAGE_WIDTH,
>                  trimPixels(directory.getDescription(ExifSubIFDDirectory.TAG_EXIF_IMAGE_WIDTH)));
>   }
>   if (directory.containsTag(ExifSubIFDDirectory.TAG_EXIF_IMAGE_WIDTH)) {
>       metadata.set(Metadata.IMAGE_LENGTH,
>                    trimPixels(directory.getDescription(ExifSubIFDDirectory.TAG_EXIF_IMAGE_HEIGHT)));
>    }
> {code}
> Also the {{CopyUnknownFieldsHandler}} overrides the values for "Image Width" ({{JpegDirectory.TAG_IMAGE_WIDTH}})
and "Image Height" ({{JpegDirectory.TAG_IMAGE_HEIGHT}}) with the values from {{ExifIFD0Descriptor.TAG_IMAGE_WIDTH}}
and {{ExifIFD0Descriptor.TAG_IMAGE_HEIGHT}} because they have the same tag name.
> I attached a sample image, these are the metadata values:
> * extracted by metadata-extractor:
> [JPEG] Image Height = 367 pixels
> [JPEG] Image Width = 1535 pixels
> [Exif IFD0] Image Width = 2173 pixels
> [Exif IFD0] Image Height = 520 pixels
> [Exif SubIFD] Exif Image Width = 1535 pixels
> [Exif SubIFD] Exif Image Height = 367 pixels
> * Tika metadata:
> Image Height: 520 pixels
> Image Width: 2173 pixels
> tiff:ImageLength: 520
> tiff:ImageWidth: 2173
> Exif Image Height: 367 pixels
> Exif Image Width: 1535 pixels



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