I've gone through and patched K2 so the K2 image cache now leaves my .png's alone. Almost all my images have transparency so they can "float" on pages without terrible backgrounds, and K2 was converting them to .jpg's in the caching algorithms.
www.vatofknow.com/?p=422 fixed a bunch of that problem (then a bit more digging in /administrator to get the control panel back showing images in items/itemlists).
Now all the SJ plugins also have some sort of secondary caching system. I see all my images being converted into /cache/mod_sj_k2_slickslider/filename.jpeg.
I've looked all over for your library that does this caching but can't find it. I'd like to fix this so the caching is done to .png's so that you retain the transparency.
Can you point me in the right direction?
Thanks!