Adds a watermark on top of a IIIF Image API server call via a node proxy server. This can be useful if you only want to display content depending on a certain condition, if you want to easily add your logo to raw images, or if you just want watermarking while preserving IIIF functionality.

To run this server:

1. Clone this repo to your machine.
2. Install graphicsMagick to allow your machine to watermark images on the fly.
3. Run npm install in the root of this projects folder.
4. Point all your manifest.json images to this mock servers port (4343)
5. Run node server.js
6. Your IIIF images will appear watermarked with the watermark.png file.

This has been tested with TIFY, Mirador and Universal viewer.

Modify the height/width of watermark.png or use the sharp API to change how the watermark appears.

If you need to easily setup a working IIIF server with images, use the image viewer comparison repo from @nationalarchives

• Using TIFY, a 6477 x 9727 Map with a 6.1MB file size loaded in 10 seconds without the watermark, and 12.5 seconds with the watermark.

• There is currently caching enabled on this proxy server, set to 60 minutes.

• If you have large images, a watermarked thumbnail will not be generated as the thumbnail may be smaller than the size of your watermark, which sharp does not allow. To solve this, I have set the server to just send an unwatermarked image if this happens.

Credits for the smiley face used goes to wikipedia