Specifications

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If needed, additional markers can be used, but they are not necessary and thus do
not affect decoding.
During JPEG compression, the CL765 only supports 4:2:2 down-sampling format
due to the hardware design requests. Since most of the sensors support CCIR601
or CCIR656 format, and output format is also 4:2:2, the CL765 uses it without
variation. In case of decoding, on the other hand, there are three down-sampling
formats as listed below.
4 : 4 : 4
4 : 2 : 2
4 : 2 : 0
4 : 1 : 1
For most of digital still cameras, 4:2:2 format is used for JPEG compression, 4:4:4
format is widely used for quality-oriented software such as graphic-related
software used in PC. For those applications for which the compression ratio is a
key concern, 4:2:0 format is mostly used. In the meantime, graphic-related
software tend to use their own unique tables rather than Huffman table and
Quantization table that JPEG recommends, the CL765 supports programmable
Quantization table and Huffman table in order to decode various types.