I suggest you try to load the shot into the software that came with the camera, the Pentax DCU (silkypix) program.
I don't know about the K-3 bundled version, but the previous version that came with my K-5 knows about all the
custom image settings and is able to unfold an applied custom image from a jpeg picture and apply another one.
In short, DCU will attempt to reverse-apply a custom image setting.
That process is not perfect of course, and the bleach bypass setting is a very extreme one that is tough to "unfold".
so don't get your hopes up too high.
Regards,
--Anders.
---------- Post added 25th Apr 2014 at 11:40 ----------
Originally posted by meSuper2 Loving my K3 but took a bunch of .jpg photos with bleach bypass selected without realizing it. This probably serves me right for not shooting raw
No, it serves you right for not being aware of your jpeg settings.
RAW is not the only solution to your problem. Common discipline will also work. When you turn on your camera, check your white balance, custom image setting and shadow protection before you shoot the first shot.
Regards,
--Anders.