Tidypics for v.1.8 with image compression

Iionly,

My version of your Tidypics plugin (1.8.0-rc1) came bundled with Elgg 1.8.13. As it did not support GD, Imagick or ImageMagick, I provided an image compressor script on the side - an extra step my users have often found too challenging. I'm aware that according to the plugin listing Tidypics for v. 1.8 now supports image (file size) compression.  My question is: Should there be any problem or loss of existing user images so long as I back up and follow the plugin installation instructions?