This script uses the utilities convert (ImageMagick) and png2icns (icnsutils) which should be installed and in the path.
Note that for some reason ICNS files should not contain a 64x64 pixel version of a logo, so the script removes this
as png2icns complains if it finds one!
+
+### Rotatable icon with white background
+
+This icon is used by the web services progress window, with the rotating Jalview logo.
+It requires some small margin of white pixels around the logo to enable antialiasing around the edge of the logo.
+You can make one form a 48x48 transparent logo with
+```
+convert jalview_logo-38.png -gravity center -background white -extent 60x60 rotatable_jalview_logo-38.png
+```