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You can resize an image on loading using one of the constructors that takes requestedWidth and requestedHeight parameters. This is useful for preserving memory when (for example) needing to display a large number of thumbnails.
Additionally, the ImageView class defines resizing functionality for the view of an Image. So you can load the full Image, then display one or more resized versions in ImageView(s).
If you need, you can retrieve an Image object representing the ImageView by calling snapshot(...) on the ImageView; for most use cases the ImageView itself will be all you need.