They are a part of Sun's JDK and JRE distributions. Although other licensees may choose to distribute these classes, developers cannot depend on their availability in non-Sun implementations. We expect that equivalent functionality will eventually be available in a core API or standard extension. YCbCr-Alpha with Y, Cb, and Cr inverted. The X and Y units simply indicate the aspect ratio of the pixels.
Pixel density is in pixels per inch.
Returns the AC Huffman coding table for the requested component. Get the number of the DC Huffman table that will be used for a particular component. Returns the DC Huffman coding table for the requested component. This value is copied from the APP0 marker. Return the Horizontal subsampling factor for requested Component.