:orphan: .. _ahelp_cjpeg: ***** cjpeg ***** .. contents:: :local: | .. code-block:: none usage: cjpeg [switches] [inputfile] Switches (names may be abbreviated): -quality N[,...] Compression quality (0..100; 5-95 is useful range) -grayscale Create monochrome JPEG file -rgb Create RGB JPEG file -optimize Optimize Huffman table (smaller file, but slow compression) -progressive Create progressive JPEG file -scale M/N Scale image by fraction M/N, eg, 1/2 -targa Input file is Targa format (usually not needed) Switches for advanced users: -arithmetic Use arithmetic coding -block N DCT block size (1..16; default is 8) -rgb1 Create RGB JPEG file with reversible color transform -bgycc Create big gamut YCC JPEG file -dct int Use integer DCT method (default) -dct fast Use fast integer DCT (less accurate) -dct float Use floating-point DCT method -nosmooth Don't use high-quality downsampling -restart N Set restart interval in rows, or in blocks with B -smooth N Smooth dithered input (N=1..100 is strength) -maxmemory N Maximum memory to use (in kbytes) -outfile name Specify name for output file -verbose or -debug Emit debug output Switches for wizards: -baseline Force baseline quantization tables -qtables file Use quantization tables given in file -qslots N[,...] Set component quantization tables -sample HxV[,...] Set component sampling factors