With Jade you can quickly enhance your pictures without actually having to work with a full fledged image editing program. You just drag and drop your pictures into the interface and can zoom in the image smoothly using your mouse.
If you click the 'Parameters' button on the top right you'll open the 'Filter Settings' (oddly not called 'Parameters') which consist of a few sliders for intensity, sharpness and fill light. You can also add color correction and contrast enhancement. Of all the effects, intensity was the one to yield the most effects. Others were not as apparent.
Overall, the parameters offered in Jade are pretty basic. This application is really meant to be used if you are looking to only add a few enhancements. As the developer says, it can be handy to quickly batch process a large amount of images, although you'll find that photo management programs like iPhoto offer similar functions.
Jade offers limited tools to quickly add a few enhancements to your pictures.