Options passed to Titanium.Media.previewImage.
NOTE This is an abstract type. Any object meeting this description can be used where this type is used.
Function called back if the preview fails. Check the message
property of passed back parameter.
The image to preview. Must be a blob based on a file, such as from Titanium.Filesystem.File.read.
Function to be called back if the preview succeeds. No info is passed.