EAS-API: /zoomer

Returns a tile or thumbnail for the zoomer

Example

http://eas.example.com/eas/zoomer/123/d8e8fca2dc0f896fd7cb4cb0031ba249/zoom1920/part2x1.jpg?instance=example
http://eas.example.com/eas/zoomer/123/d8e8fca2dc0f896fd7cb4cb0031ba249/thumbnail.jpg?instance=example

From version 4.2.37, the EAS for /zoomer also supports the following syntax:

 http://eas.example.com/eas/zoomer/123/d8e8fca2dc0f896fd7cb4cb0031ba249/zoom1920[/size320][/avoid_interpolation]/part2x1.jpg?instance=example

Structure

The path parts to zoomer are structured as follows:

• Asset ID
• Asset version (MD5)
• zoom<destdim> where destdim is the target dimension (pixels, see below)
• size<size>, where size is the tile size (pixels, if unset: 320) (from version 4.2.37)
• avoid_interpolation: Do not use interpolation if the zoom factor is a natural number (from version 4.2.37)
• part<tile_x>x<tile_y>.jpg, where (tile_x, tile_y) are the tile coordinates. (0,0) is top left

The zoom factor is specified by the target dimension. That is, the image is zoomed so that the width of the resulting image is as large as this parameter. The zoom factor is: destdim / image_width.

In the example, if the original image is (3840x1200), the zoom factor is 1920/3840 = 0.5. The zoomed image is (1920x600).

If avoid_interpolation is set, the zoom factor must be less than 1 or a natural number. This means: 0.5 is allowed, but 1.5 is not allowed.

Parameter