The Large Image Solution Pack module supports ingesting and viewing TIF/TIFF files, which by nature tend to be extremely large in both filesize and resolution. The module supports creation of derivatives for use when a smaller filesize is necessary, and also supports the installation of image viewers that can accommodate the larger resolution.
To successfully create derivative datastreams, ImageMagick (TN & JPG) needs to be installed on the server. To create JP2 datastreams, Kakadu is the preferred solution, but ImageMagick can be used if it has been built with JPEG2000 support.
Release Notes and Downloads
The Large Image Solution Pack module's configuration page can be found at http://path.to.your.site/admin/islandora/solution_pack_config/large_image, and contains the following settings:
- Lossless Derivative Creation?: Enabling this will force the Large Image Solution Pack to use reversible lossless compression when creating JP2 derivatives. When a JP2 original is uploaded, a second "use" copy is created for the JP2 datastream.
- Use Kakadu for Image Compression?: The Kakadu software suite can be installed on your server to take advantage of its much faster kdu_compress program. Users often use the copy of kdu_compress that comes bundled with Djatoka (see below), but you can also check out the official website at http://www.kakadusoftware.com/ for download and installation instructions.
Configure the image-tool kit to use ImageMagick rather than GD in Administration > Configuration > Media > Image Toolkit (admin/config/media/image-toolkit). If GD is selected, TN and JPG datastreams will not be generated.
Select configuration options and viewer in Administration > Islandora > Solution pack configuration > Large Image Collection (admin/islandora/solution_pack_config/large_image).
To use Kakadu, make sure that
kdu_expand are avaliable to the Apache user. Often users will create symbolic links from
/usr/local/bin/kdu_compress to their installation of Kakadu that comes bundled with Adore-Djatoka. Make sure that the required dynamic libriraries that come with Kakadu are accessible to
kdu_expand. If they are not present, attempting to run either command from the terminal will inform you it's libraries are missing. You can also use a symbolic link from
/usr/local/lib to include these libraries, remember to restart the terminal so your changes take affect. Also, make sure the php settings allow for enough memory and upload size: upload_max_filesize, post_max_size and memory_limit.
If no viewers are installed, the Large Image Solution Pack module will use its standard viewer to display images. For better results, the Open Seadragon library can be installed; check that page for further instructions. If it is installed, it can be selected here.
Content Models, Prescribed Datastreams and Forms
The Large Image Solution Pack comes with the following objects in http://path.to.your.site/admin/islandora/solution_pack_config/solution_packs:
- Islandora Large Image Content Model (islandora:sp_large_image_cmodel)
- Islandora Large Image Collection (islandora:sp_large_image_collection)
An image ingested using the Large Image Solution Pack's content model using ImageMagick will have the following datastreams:
Default Fedora relationship metadata
MODS record filled out during ingest
Dublin Core record
Original TIFF or JP2 file uploaded
|JP2||JPEG 2000 derivative created by ImageMagick or Kakadu|
|JPG||Medium-sized JPEG created by ImageMagick and used in the standard image viewer|
|TN||Thumbnail icon created from the image during the ingest process|
The Large Image Solution Pack comes with the Large image MODS form.