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It is highly recommended to use hardware accelerated (sharp or gm) lib for thumbnail generation

Thumbnail generation library

Make sure that sharp node module is installed (npm install sharp).

Make sure that gm node module and

GraphicsMagick

are installed (npm install sharp).

Thumbnail folder

Thumbnails will be saved in this folder. Write access is required

Thumbnail Quality

High quality may be slow. Especially with Jimp.

Icon size

Icon size (used on maps)

Thumbnail sizes

Size of the thumbnails.

The best matching size will be generated. (More size gives better quality, but use storage to store and CPU to render.)

';' separated integers. If size is 200, that thumbnail will have 200^2 pixels.