Resizing Images with Photoshop programatically (SDK) ?

Hello,

We have more 100,000+ master images that must be resized down programatically (over a nightly batch job).  We are losing photoquality when resizing these images (JPEGs).  However, when I resize these images in Photoshop, it produces very high quality images.

This needs to be done programatically, is there an option to buy an SDK from Adobe where we can programatically resize these images on the fly?

Basically, we need to use the same mechanism that photoshop uses to resize images, because it does a wonderful job of preserving the image quality, but we need programatic  access to it.

Thanks,

Raman