Web service for converting scans and serving metadata for the converted images

This repository contains a node based application that

• monitors some directory for new images and checksum files
• converts those images to JPEG2000 in another directory
• provides a web interface to navigate the directories
• generated IIIF presentation JSON for use with UniversalViewer or Mirador it uses
• https://iiif.io/api/presentation/2.1/
• https://www.openjpeg.org/ and
• https://nodejs.org/en

This is an alpine based image.

This service is meant to be used with a corresponding iipsrv (or similar) server which serves images according to IIIF image API in /iiif/images.

Checking copied scans

md5sum output files in a IMAGE_MD5_CHECKSUMS_FILES trigger a check TBD: How to view, how to report errors

Converting scans

Browsing the /images url you can see the scans on the servers IMAGE_DATA_PATH. Hiting the Convert button converts all scans in IMAGE_DATA_PATH and stores JPEG2000 and pyramid TIFF files in JP2_DATA_PATH. The directory structure is mirrored.

Metadata to access the images

Using IMAGE_DATA_PATH {collection name}.json and the directory structure (in JP2_DATA_PATH) IIIF presentation metadata is generated in /iiif/presentation/* so Mirador can view the images.

• There is a collection with the filename of the config file
• The collection contains links to one manifest per subfoilder
• The manifests contain all the image paths for one subfolder in the only sequence[0] and
• they contain structures that correpond to the subfolders subfolder (used for an index)

Memcache access

There is a kind of debugging service to read and write memcache