You are reading 13.1.0. See this page in 13.4.1.
PreviewImageOptions
pseudoAndroid
Options passed to Titanium.Media.previewImage.
Properties 3
error
Callback<PreviewImageError>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.
success
Callback<SuccessResponse>Function to be called back if the preview succeeds. No info is passed.