[[Image:Damaged_N00153918.jpg|thumb|center|450px|The Cassini camera was pointing toward DIONE at a distance of approximately 548,210 kilometers. The image was taken using the CL1 and CL2 filters on May 17, 2010.]]
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====Cassini Lossless Compression====
Both converted (8-bit) and unconverted (12-bit) data can be losslessly compressed. The Cassini hardware data compressor uses Huffman encoding.
Both converted (8-bit) and unconverted (12-bit) data can be losslessly compressed. The Cassini ISS lossless hardware compressor is based on Huffman encoding. With ISS lossless compression, each compressed image can be reconstructed on the ground with no loss to the information content of the image, provided the image entropy does not exceed the threshold where 2:1 compression is achieved. Low entropy images will have compression ratios higher than 2:1. High entropy scenes will have lower compression ratios. A the ends of lines will be truncated so that the total amount of data returned in a pair of lines of the image never exceeds the total number of bits for a single uncompressed line.
Each compressed image can be reconstructed on the ground with no loss to the information content of the image, provided the image entropy does not exceed the threshold where 2:1 compression is reached.
