Images are decoded at full resolution, potentially causing excess memory commit

When loading an Image element where the source is an excessively large image - the image is decoded at it's native resolution. This can potentially cause a very large memory commitment in cases where you're only displaying a small screen area (e.g. allocating a 1024*768 32bit image which is displayed in a 320*240 Image element). By default, Images should be loaded in display-specific resolution, and optionally re-decoding the image once the image is resized above a defined threshold. These parameters should probably be part of the Image element