Use an optional sub-image specification to select a desired scene of a multi-resolution image format like Photo CD (e.g. 4) or a range for MPEG images (e.g. video.mpg[50-75]). A scene specification can be disjoint (e.g. 2,7,4). For raw images, specify a scene as a geometry (e.g. 320x256+50+50).


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