You can mount the partitions as loop devices.
Assuming the command to make the images was something like:
ddrescue /dev/sdb1 ./name1.img ./name1.log
ddrescue /dev/sdb2 ./name2.img ./name2.log
Then you should be able to do something like
mkdir name1 name2
mount -o loop,ro name1.img name1
mount -o loop,ro name2.img name2
Now you can just browse into these using 'cd' or a graphical file browser and copy out what you want.
If the images fail to mount then performing a fsck might get the data readable (probably best to back up the images before doing this).
Photorec is also a good suggestion from schneidz (see above). Foremost and scalpel can also be used although if the ddrescue went well it shouldn't be that hard.
Best of luck to you.