Motifs categories folders are represented as tabs of icons. The click on icon reload the content of the motifs' selector. Motifs categories could be defined with 'folders.xml' file at the xml folder. Categories are shown in the order defined in this file (top to bottom). Folder tag identifier is the real physical name of folder on the disk, folder tag content is the representation of text label for the folder. This is made to allow utf support for folder names shown to the user. 
  
If there is no 'folders.xml' file found, folders are sorted alphabetically, real folder name is used as folder text label representation.

We use 2 folders for motifs 
  * 'motif' folder contains categorized thumbnails of motifs (could be low quality) - to show on the browser page as motif selector
  * 'print_motifs' folder contains actual large images used for label generation 

Background images are shown as icons list on popup. The click on background icon calls label generation function

We use 2 folders for background images 
  * 'backgrounds' folder contains categorized thumbnails of backgrounds (could be low quality) - to show on the browser page as background image selector
  * 'print_backgrounds' folder contains actual large images used for label generation