For any file of the form file.ext uploaded into the system will have thumbnails generated in up to severel sizes and two formats. The number of thumbails generated depends on the size of the original image being uploaded. These appear as links in an image catalog page: xs sm med lg xlg.

00-0-Copr_date_name.png
xs sm med lg xlg
(120) 249 800 1280 1920 4096

The smallest thumbnail ('xs') is generated if the image is over 249 pixels. A 249px thumb (for "thumbnail") is made and 't' is appended to that filename: filet.ext

If the image is over 800 pixels then A 800px medium thumb ('sm') is made and 'x' is appended to the filename: filex.ext


If the image is over 1280 pixels then A 1280px large thumb ('med') is made and 's' is appended to the filename: files.ext


If the image is over 1920 pixels then A 1920px large ('lg') thumb is made: file.ext

If the image is over 4096px pixels then A 4086px thumb ('xlg') is made and 'v' is appended to the filename: filev.ext

A 120px Base 64thumb ('filet.ext --> ./.b64/filet.ext.b64') is made and '.b64' is appended to the file-extension: filet.ext.b64

Since 2019 nearly all photos are re-sampled to 4K.