To get the images in a format different than a binary file they must be queried using images API
and download them.
Use librariesManager.Download method.
LibrariesManager librariesManager = LibrariesManager.GetManager();
var listOfImages = librariesManager.GetImages().Where(i => i.Status == ContentLifecycleStatus.Live && i.Visible ==
var imageBinaryStream = librariesManager.Download(image);
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