Prepr Documentation

Prepr Documentation

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Resizing images with NPO CDN


The Images API is a read-only API for delivering images to apps, websites and other media outlets.

The Images API is available via a distributed content delivery network (CDN) powered by NPO ICT services.

You can request images in in specific sizes and crops.

Images are returned with a cdn_files field. This object returns a cdn_url param that you can use as a basis for resizing the image needed for your app.

The url contains a part that is returned as {format} you need to replace this with the desired format.
Options are width (w), height (h), quality (q) and crop (c).

Crop options: (default: centre)
north, northeast, east, southeast, south, southwest, west, northwest, center, centre

The format is constructed as {option}_{value} so if we would wanted to get the image in a 200px width form, {format} would be replaced with w_200.

To simplify this it is possible to let the API construct those urls for you. Just add them as an extra field in the cdn_files field. For example:


"cdn_files": [{
  "id": "0e10b16-a403-41c1-bb2d-b13b1715585",
  "created_on": "2018-04-17T19:45:53+00:00",
  "changed_on": null,
  "label": "SourceFile",
  "original_name": "74658732548727647823678.jpg",
  "mime_type": "image/jpeg",
  "file_size": 10157,
  "file": "",
  "cdn_url": "{format}/example/0e10b16-a403-41c1-bb2d-b13b1715585.jpg",
  "resized": {
    "landing": ",h_232/example/0e10b16-a403-41c1-bb2d-b13b1715585.jpg"

This will add an extra param to the object with the pre-rendered url. It is possible to add up to 3 different formats into the request.

Resizing images with NPO CDN

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