Naveenn - 2:37 pm on Aug 15, 2012 (gmt 0)
Thank you guys for all the help and discussion. I have now allowed image pages to be indexed and pointed the Canonical url to "category page". I have around 350 categories and 12000+ images. I believe 12000+ images pointing to 350 categories resp; should boost the category pages.
I will update you about anything positive/negative out of this.