Hi, Just a quick message, I am still progressing with very high compression and I have corrected a processing, so now very high compression (-l10 to -l13 quality settings) has really better precision and so better quality.
I have also released a first draft of a new -l14 very high compression quality setting. More at: http://nhwcodec.blogspot.com/ -Just a remark, the entropy coding schemes start to be less efficient at -l14 very high compression, and we can really improve them and save bits.For example the coding of the wavelet DC coefficients, wavelet DC image is far from optimal.I have 4 compression modes for 4 different data nature for the wavelet DC image, but I just choose the overall best coding mode for the whole wavelet DC image... this is not optimal, I can really save bits if for example I split the wavelet DC image in 16x16 blocks, and give the one appropriate mode to each block, adapted to their nature.- Again using paq8px compressor, and simply compressing the .nhw compressed files, we see that we can save 2.5KB per .nhw file... Any feedback on the new -l14 quality setting and on the quality improvements is, as usual, very welcome! Many thanks again! Cheers, Raphael
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