fit curve on to an imported graph

*To*: mathgroup at smc.vnet.net*Subject*: [mg131172] fit curve on to an imported graph*From*: Joug Raw <jougraw at gmail.com>*Date*: Sat, 15 Jun 2013 04:24:08 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net

I have a graph in .png format generated from other software and want to generate some curves like (a/x)^-1/b in mathematica and compare the curve to the graph directly. I am wondering how could I import the .png image and generate the (a/x)^-1/b on to that image? If the curve can be shown in Manipulate[...] way that would be better, since I can adjust the parameters a and b and see the changing on the background of the imported image. thanks for your help!