The UMSJPEGImageReader object is an Ultimedia Services Version 2 feature and does not apply to Ultimedia Services Version 1.2.1.
The JPEG support in the image reader is based on the UMS JPEG video decoder, and hence is subject to the latter's limitations. Not all JPEG image formats are supported, and only the first image in a file can be read. For more information, see "UMSJPEGDecoder Object" . The JPEG image reader supports all UMS image reader base methods, and it does not have any unique methods. The UMS image reader base methods are available in "UMSImageReader Object" .
For introductory information, see Formatted File Access Objects.