新画像フォーマット BPG は 可逆圧縮もすばらしいことが判明

Main options:
-h                   show the full help (including the advanced options)
-o outfile           set output filename (default = out.bpg)
-q qp                set quantizer parameter (smaller gives better quality,
                     range: 0-51, default = 28)
-f cfmt              set the preferred chroma format (420, 422, 444,
                     default=420)
-c color_space       set the preferred color space (ycbcr, rgb, ycgco,
                     ycbcr_bt709, ycbcr_bt2020, default=ycbcr)
-b bit_depth         set the bit depth (8 to 12, default = 8)
-lossless            enable lossless mode
-e encoder           select the HEVC encoder (jctvc, default = jctvc)
-m level             select the compression level (1=fast, 9=slow, default = 8)