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https://issues.apache.org/jira/browse/TIKA-2630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16668856#comment-16668856
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ASF GitHub Bot commented on TIKA-2630:
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dameikle commented on issue #255: TIKA-2630: Wrong height and width metadata
for JPEG images
URL: https://github.com/apache/tika/pull/255#issuecomment-434342088
@tballison Thanks for looking over it - my main worry was changing the
behaviour. There is a fixed structure that one should expect with data included
in them only if written, so we could make them static property prefixes. I
think the directory name is safe in this instance given how the format works
and agree the prefix route - its easy enough to make this fixed against those
directories. I'll go with that.
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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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