Resizing images via hooks: two questions

[DrQuincy]

Hi,

I have done a few sites with PW now and love it — thanks so much for it.

Up to now, I've done image resizing in the templates but this can make the font-end very slow when images are generated (but is fine for subsequent pages loads).

To speed it up I have:

1. Enabled client-side browser-resizing so huge images are scaled down before upload
2. Added an InputfieldFile::fileAdded hook so images are re-sized in the admin so the front-end should never have to resize

This seems to work great, I just wanted a second opinion to confirm that:

1. Variations created this way will be deleted when the page is deleted, i.e. I do not need a fileDeleted hook
2. The front-end will never re-generate the images (presuming the admin created them) when I call $image->size($imgWidth, $imgHeight)

I believe the above two assumptions are correct; I just wanted it confirming. ?

Thanks!