Hello all,

I have some 300x300 png32 tiles and I noticed they take a very long time to load on websites.

I would need to reduce the size of the files without loosing quality. The ~size of a tile is 270 KiB and I would like to get to ~80. The tiles can represent sat images, environment images and maps, in general.

I managed to convert a tile using imagemagick's convert option and I got a good result with jp2000. The problem is that I cannot keep the transparency. 

The issue is that I also need the format to support transparency as I have overlays as well.. Can anyone help me out with some suggestions? 
Raiz Roland Robert