110 lines
2.8 KiB
Groff
110 lines
2.8 KiB
Groff
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'\" The line above instructs most `man' programs to invoke tbl
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.TH opj_decompress 1 "Version 1.4.0" "opj_decompress" "converts jpeg2000 files"
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.P
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.SH NAME
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opj_decompress -
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This program reads in a jpeg2000 image and converts it to another
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image type. It is part of the OpenJPEG library.
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.SP
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Valid input image extensions are
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.B .j2k, .jp2, .j2c, .jpt
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.SP
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Valid output image extensions are
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.B .bmp, .pgm, .pgx, .png, .pnm, .ppm, .raw, .tga, .tif \fR. For PNG resp. TIF it needs libpng resp. libtiff .
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.SH SYNOPSIS
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.P
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.B opj_decompress -i \fRinfile.j2k \fB-o \fRoutfile.png
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.P
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.B opj_decompress -ImgDir \fRimages/ \fB-OutFor \fRbmp
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.P
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.B opj_decompress -h \fRPrint help message and exit
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.P
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.R See JPWL OPTIONS for special options
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.SH OPTIONS
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.TP
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.B \-\^i "name"
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(jpeg2000 input file name)
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.TP
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.B \-\^l "n"
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n is the maximum number of quality layers to decode. See LAYERS below)
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.TP
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.B \-\^o "name"
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(output file name with extension)
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.TP
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.B \-\^r "n"
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(n is the highest resolution level to be discarded. See REDUCTION below)
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.TP
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.B \-\^x "name"
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(use name as index file and fill it)
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.TP
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.B \-\^ImgDir "directory_name"
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(directory containing input files)
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.TP
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.B \-\^OutFor "ext"
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(extension for output files)
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.P
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.SH JPWL OPTIONS
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Options usable only if the library has been compiled with
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.B -DUSE_JPWL
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.TP
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.B -W c\fR[=Nc] (Nc is the number of expected components in the codestream; default:3)
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.TP
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.B -W t\fR[=Nt] (Nt is the maximum number of tiles in the codestream; default:8192)
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.TP
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.B -W c\fR[=Nc]\fB, t\fR[=Nt] \fR(same as above)
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.P
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.SH REDUCTION
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Set the number of highest resolution levels to be discarded.
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The image resolution is effectively divided by 2 to the power of the number of discarded levels. The reduce factor is limited by the smallest total number of decomposition levels among tiles.
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.SH TILES
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Set the maximum number of quality layers to decode. If there are less quality layers than the specified number, all the quality layers are decoded.
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.P
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'\".SH BUGS
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.SH AUTHORS
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Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
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.br
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Copyright (c) 2002-2014, Professor Benoit Macq
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.br
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Copyright (c) 2001-2003, David Janssens
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.br
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Copyright (c) 2002-2003, Yannick Verschueren
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.br
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Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
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.br
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Copyright (c) 2005, Herve Drolon, FreeImage Team
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.br
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Copyright (c) 2006-2007, Parvatha Elangovan
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.P
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.SH "SEE ALSO"
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opj_compress(1) opj_dump(1)
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