How to get Watermarking like logo overlapping the uploaded image.

I am waiting for Tidy pics release for 1.8 and dont know if it gives the possibility to overlap the uploaded images with sitelogo or not., but previous versions allowed for only text overlap over the pics., will it be possible to do logo overlap . If it does not allow in plugin., is there any tweak to use to do the same.. 

Any articles or pointers would be helpful.