493250 JPEG TO PNG And Image Manipulation of stock Images

Hello. I have sets of Images in JPEG. I am looking for a way to Make PNG with features Below: You may use any script you can find to assist you as long you provide what I need. - Images should be transparent - All images hould have same size but different Fabric. - When we overlap all images it should form 1 single image Concept is similar to Shirt Customization with separate images for Collar, Cuff, Buttons etc I need your BEST Bid for creating 10- 3d Images with 100 or more Fabric sets. Please send me 3 of your best working websites. Time wasters, please skip this Post, as I have zero tolerance.