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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:43:11 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-15 19:43:11 +0000
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parentInitial commit. (diff)
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Adding upstream version 4.22.0.upstream/4.22.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+\
+.\" This man page was generated by the Netpbm tool 'makeman' from HTML source.
+.\" Do not hand-hack it! If you have bug fixes or improvements, please find
+.\" the corresponding HTML page on the Netpbm website, generate a patch
+.\" against that, and send it to the Netpbm maintainer.
+.TH "Jpeg2ktopam User Manual" 0 "08 October 2009" "netpbm documentation"
+
+.SH NAME
+jpeg2ktopam - convert JPEG-2000 code stream to PAM/PNM
+
+.UN synopsis
+.SH SYNOPSIS
+
+\fBjpeg2ktopam\fP
+[\fB-verbose\fP]
+[\fB-debuglevel=\fP\fInumber\fP]
+\fIfilename\fP
+
+.SH OPTION USAGE
+.PP
+Minimum unique abbreviation of option is acceptable. You may use double
+hyphens instead of single hyphen to denote options. You may use white
+space in place of the equals sign to separate an option name from its value.
+
+.UN description
+.SH DESCRIPTION
+.PP
+This program is part of
+.BR "Netpbm" (1)\c
+\&.
+.PP
+\fBjpeg2ktopam\fP converts the named JPEG-2000 file (JP2 or JPC),
+or Standard Input if no file is named, to a PBM, PGM, PPM, or PAM
+file on Standard Output.
+.PP
+The JPEG-2000 specification specifies two different formats: JP2 and
+JPEG-2000 code stream (JPC). JP2 represents a visual image quite
+specifically, whereas JPC is a more or less arbitrary array of codes. A JP2
+image contains a JPC stream and metadata describing how that stream represents
+a visual image. \fBjpeg2ktopam\fP converts both.
+.PP
+If the color space identified in the image is grayscale
+(JAS_IMAGE_CS_GRAY), \fBjpeg2ktopam\fP generates a PGM image, unless the
+image contains only one bit per pixel, in which case \fBjpeg2ktopam\fP
+generates PBM. If the color space is RGB (JAS_IMAGE_CS_RGB),
+\fBjpeg2ktopam\fP generates a PPM image. If the input image is anything
+else, \fBjpeg2ktopam\fP generates a PAM image with no tuple type identified.
+.PP
+In the PGM and PPM cases, \fBjpeg2ktopam\fP assumes the intensity
+values in the input image have the same meaning as for PGM and PPM.
+One thing that implies is the ITU-R Recommendation BT.709 color space,
+which means the assumption is false for JP2 input. JP2 input uses
+SRGB color encoding. So if you use \fBjpeg2ktopam\fP to convert a
+JP2 image to PPM, it changes the visual image (slightly) -- the colors
+in the output are not the same as in the input.
+.PP
+In the PAM image, the output samples are numerically identical to
+the input samples. If the input samples are signed, they are
+represented in two's complement form in the output (because PAM
+samples are always unsigned). The PAM plane numbers are identical to
+the JPC component numbers.
+.PP
+A JPEG-2000 image has a "precision," which is the number of bits used for
+each code (in Netpbm lingo, "sample"). Actually, each component has a
+separate precision. The maxval of a PGM, PPM, or PAM output is the
+largest number you can represent in the JPEG-2000 precision of the JPEG-2000
+component with the greatest precision. The samples in all components are
+scaled to that maxval. So if the red component has a precision of 4 bits
+and the green component has a precision of 6 bits, the maxval is 63 and
+the red component codes from the JPEG-2000 image are multiplied by 63/15 to
+generate the output samples.
+.PP
+\fBjpeg2ktopam\fP interprets the JPEG-2000 input with the
+.UR http://www.ece.uvic.ca/~mdadams/jasper/
+Jasper JPEG-2000 library
+.UE
+\&. See documentation of the library for details on what
+\fBjpeg2ktopam\fP handles. Note that the Jasper library contains
+facilities for writing PNM images, but \fBjpeg2ktopam\fP does not use
+those. It uses the Netpbm library instead. Note that the makers of
+the Jasper library write it "JasPer," but Netpbm documentation follows
+standard American English typography rules, which don't allow that
+kind of capitalization.
+.PP
+Use \fBpamtojpeg2k\fP to convert in the other direction.
+.PP
+The program \fBjasper\fP, which is packaged with the Jasper
+JPEG-2000 library, also converts between JPEG-2000 and PNM formats.
+Because it's packaged with the library, it may exploit it better,
+especially recently added features. However, since it does not use the
+Netpbm library to read and write the Netpbm formats, it doesn't do as
+good a job on that side.
+
+.UN options
+.SH OPTIONS
+
+
+
+.TP
+\fB-verbose\fP
+This option causes \fBjpeg2ktopam\fP to issue informational
+messages about the conversion process.
+
+.TP
+\fB-debuglevel\fP=\fInumber\fP
+This option controls debug messages from the Jasper library.
+\fBjpeg2ktopam\fP passes \fInumber\fP as the debug level to the Jasper
+JPEG-2000 decoder.
+
+
+
+.UN examples
+.SH EXAMPLES
+
+.nf
+ jpeg2ktopam myimg.jpc >myimg.ppm
+.fi
+
+
+.UN jpeg2000
+.SH ABOUT JPEG-2000
+.PP
+See
+.BR "the \fBpamtojpeg2k\fP manual" (1)\c
+\&
+for general information on JPEG-2000 compression and the
+JPEG-2000 formats.
+
+
+.UN seealso
+.SH SEE ALSO
+.BR "pamtojpeg2k" (1)\c
+\&,
+.BR "jpegtopnm" (1)\c
+\&,
+.BR "ppm" (5)\c
+\&,
+.BR "pgm" (5)\c
+\&,
+.BR "pbm" (5)\c
+\&,
+.BR "pam" (5)\c
+\&,
+
+.SH History
+.PP
+\fBjpeg2ktopam\fP was added to Netpbm in Release 10.12 (November 2002).
+.PP
+Before Netpbm 10.49 (December 2009), \fBjpeg2ktopam\fP could not convert
+a JP2 file -- only JPC.
+.SH DOCUMENT SOURCE
+This manual page was generated by the Netpbm tool 'makeman' from HTML
+source. The master documentation is at
+.IP
+.B http://netpbm.sourceforge.net/doc/jpeg2ktopam.html
+.PP \ No newline at end of file