NAME

opj_compress - This program reads in an image of a certain type and converts it to a jpeg2000 file. It is part of the OpenJPEG library.

Valid input image extensions are .bmp, .pgm, .pgx, .png, .pnm, .ppm, .raw, .tga, .tif . For PNG resp. TIF it needs libpng resp. libtiff .

Valid output image extensions are .j2k, .jp2

SYNOPSIS

opj_compress -i infile.bmp -o outfile.j2k

opj_compress -ImgDir directory_name -OutFor jp2

opj_compress -h Print a help message and exit.

See JPWL OPTIONS for special options

OPTIONS

-b n,n: (Size of code block (e.g. -b 32,32). Default: 64 x 64)
-c n: (Size of precinct (e.g. -c 128,128). Default: 2^15 x 2^15)
-cinema2K fps: Digital Cinema 2K profile compliant codestream. Valid fps values are 24 or 48.
-cinema4K: Digital Cinema 4K profile compliant codestream. Does not need an fps: default is 24 fps.
-d X,Y: (Offset of image origin (e.g. -d 150,300))
-h: Print a help message and exit.
-i name: (input file name)
-n n: (Number of resolutions. Default: 6)
-o name: (output file name)
-p name: Progression order. name can be one out of:LRCP, RLCP, RPCL, PCRL, CPRL. Default: LRCP.
-q n: different psnr for successive layers
Note: (options -r and -q cannot be used together)
-r n: different compression ratio(s) for successive layers. The rate specified for each quality level is the desired compression factor.
Note: (options -r and -q cannot be used together)
-s X,Y: sub-sampling factor (e.g. -s 2,2). Default: No sub-sampling in x or y direction.
Remark: sub-sampling bigger than 2 can produce errors.
-t W,H: (Size of tile (e.g. -t 512,512) )
-x name: (Create index file and fill it. Default: no index file)
-EPH: (Write EPH marker after each header packet. Default:no EPH)
-F rawWidth,rawHeight,rawComp,rawBitDepth,s_or_u: characteristics of the raw input image
-I: (Use the irreversible DWT 9-7. Default: Reversible DWT 5-3)
-ImgDir directory_name: (directory containing input files)
-M n: mode switch with values: 1, 2, 4, 8, 16, 32. Default:No mode switch activated.
Meaning:
BYPASS(1)
RESET(2)
RESTART(4)
VSC(8)
ERTERM(16)
SEGMARK(32)
Values can be added: RESTART(4) + RESET(2) + SEGMARK(32) = -M 38
-OutFor ext: (extension for output files)
-POC TtileNr=resolutionStart, componentStart, layerEnd, resolutionEnd, componentEnd, progressionOrder: (see Examples)
-ROI c=n,U=n: quantization indices upshifted for component c (0 or 1 or 2) with a value of U (>= 0 and <= 37)
e.g. -ROI c=0,U=25
-SOP: (Write SOP marker before each packet. Default: No SOP marker in the codestream.)
-T X,Y: (Offset of the origin of the tiles (e.g. -T 100,75) )
-W: (see JPWL OPTIONS)

JPWL OPTIONS

Options usable only if the library has been compiled with -DUSE_JPWL

-W h<tilepart><=type>, s<tilepart><=method>, a=<addr>, z=<size>, g=<range>, p<tilepart:pack><=type>

h selects the header error protection (EPB): type can be
[0=none 1,absent=predefined 16=CRC-16 32=CRC-32 37-128=RS]
if tilepart is absent, it is for main and tile headers
if tilepart is present, it applies from that tile
onwards, up to the next h<> spec, or to the last tilepart
in the codestream (max. 16 specs)

p selects the packet error protection (EEP/UEP with EPBs)
to be applied to raw data: type can be
[0=none 1,absent=predefined 16=CRC-16 32=CRC-32 37-128=RS]
if tilepart:pack is absent, it is from tile 0, packet 0
if tilepart:pack is present, it applies from that tile
and that packet onwards, up to the next packet spec
or to the last packet in the last tilepart in the stream
(max. 16 specs)

s enables sensitivity data insertion (ESD): method can be
[-1=NO ESD 0=RELATIVE ERROR 1=MSE 2=MSE REDUCTION 3=PSNR
4=PSNR INCREMENT 5=MAXERR 6=TSE 7=RESERVED]
if tilepart is absent, it is for main header only
if tilepart is present, it applies from that tile
onwards, up to the next s<> spec, or to the last tilepart
in the codestream (max. 16 specs)

g determines the addressing mode: range can be
[0=PACKET 1=BYTE RANGE 2=PACKET RANGE]

a determines the size of data addressing: addr can be
2/4 bytes (small/large codestreams). If not set, auto-mode

z determines the size of sensitivity values: size can be
1/2 bytes, for the transformed pseudo-floating point value

EXAMPLES

opj_compress -i file.bmp -o file.j2k -r 20,10,1 (compress 20x, then 10x, then lossless).

opj_compress -i file.ppm -o file.j2k -q 30,40,50

opj_compress -i file.pgx -o file.j2k -POC T1=0,0,1,5,3,CPRL

opj_compress -i lena.raw -o lena.j2k -F 512,512,3,8,u

AUTHORS

Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
Copyright (c) 2002-2014, Professor Benoit Macq
Copyright (c) 2001-2003, David Janssens
Copyright (c) 2002-2003, Yannick Verschueren
Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
Copyright (c) 2005, Herve Drolon, FreeImage Team
Copyright (c) 2006-2007, Parvatha Elangovan