Ancuta Morarasu created TIKA-2630:
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Summary: 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
Reporter: Ancuta Morarasu
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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