[TIKA-2630] Wrong height and width metadata for JPEG images

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.17
• Component/s: parser
• Assignee: Dave Meikle
• Reporter: Ancuta Morarasu
• Created: 12/Apr/18 08:39
• Updated: 4 days ago 03:21
• Resolved: 5 days ago 19:58

Description

According to Exif specs, 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(...) should extract and set these in the metadata:

 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)));
   }

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

Issue Links

• links to: GitHub Pull Request #255