A simple Core Image kernel based effect, that allows for offsetting the R, G and B channels of an image on the x and y axis.
Probably quite similar to Memo's version from way back in the day, but I can't seem to download that one ;-)
Pretty self explanatory: X and Y offset for each channel.
Shifts RGBA Channels independently with a few different modes.
0: simple shift
1: repeat edge pixels
2: wrap around edge pixel pixels
3: mirror edge pixels