IIIF R&D

[mcritchlow]

Descriptive summary

Initial evaluation of IIIF options, particularly based on the excellent experience written up by Jonathan at CHF: https://bibwild.wordpress.com/2017/08/29/full-res-pan-and-zoom-js-viewer-on-a-sufiahyrax-app/

Of particular interest are:

• Evaluating Cantaloupe
• Evaluating vips vs graphicsmagick vs imagemagick to generate static tilesets (as we've done w/ DAMS4). The performance gains from vips as written about, as well as graphicsmagick over imagemagick seem well worth exploring.

Rationale

Based on the information we have available, we want to try and make the best decision about what to do with image derivatives.

[lsitu]

@mcritchlow I've added initial support for IIIF with OpenSeadragon and Cantaloupe (see PR https://github.com/ucsdlib/horton/pull/137). We can test it on the demo server once it's ready. Here is the steps to setup and run Cantaloupe:

• Download the latest Cantaloupe release 3.3.2 from https://medusa-project.github.io/cantaloupe/get-started.html.
• Copy cantaloupe.properties.sample and rename it cantaloupe.properties
• Edit FilesystemResolver.BasicLookupStrategy.path_prefix in cantaloupe.properties: FilesystemResolver.BasicLookupStrategy.path_prefix = /path/to/Fedora/filestore/ (For example $HOME/horton/tmp/fcrepo4-test-data/fcrepo.binary.directory/)

Note that Cantaloupe can be configured to use different processor like GraphicsMagickProcessor, ImageMagickProcessor etc. to handle different file formats and the default is Java2dProcessor. And I think we can configure it to test the performance with GraphicsMagick and ImageMagick later.

[lsitu]

@mcritchlow @VivianChu I found a little bug and create another PR to fix it with a couple more tests to improve the test coverages: https://github.com/ucsdlib/horton/pull/138. Thanks.