I can't import images
I had a similar issue while using Feeds, Feeds XLS and Feeds Tamper. I solved it by copying the images in the path mentioned before importing using Feeds.

I am not sure but I think you should first run a script that copies the images onto the path mentioned in the Image field and then import nodes using Feeds.

For example, if your path to images is 'sites/default/files/myimages', you should first copy the images to 'myimages' folder and then run Feeds because Feeds/Feeds Tamper simply populate the file path AFAIK. These modules do not actually save the images.

Let me know if this helps.

Regards,

Supriya Rajgopal