We need a simple web-application for integration into existing website. Our client is providing engraving of images onto jewelery.

The task is to make a little web-application (flash? jquery? java?) that can preview a user-uploaded image onto a preloaded image of a jewelery. The user-image will appear transparent on top of the jewelery, in black/white/greyscale.

There must be possibility to zoom in and out, rotate, and position the user-image onto the jewelery for best fit.
When end-user is happy, these two images are merged into one image that will be stored on serverside or FTP.

The jewelery could have many different forms (up to 70 different types), so there must be made some sort of masking that tells the application where the user-image should appear onto jewelery. Please look attached image of a jewelery example for better understanding.

Here is an example of exactly what we need:

https://as.photoprintit.de/web/84019559/productEditor.do?productId=556

You find a image, you upload it, then you drag it onto the jewelery. Then position the image. After that, merge the images, and the applications task is done.