man/man1/pvalue.1

.\" RCSid "$Id: pvalue.1,v 1.7 2008/11/10 19:08:17 greg Exp $"
.TH PVALUE 1 1/15/99 RADIANCE
.SH NAME
pvalue - convert RADIANCE picture to/from alternate formats
.SH SYNOPSIS
.B pvalue
[
.B options
]
[
.B file
]
.br
.B "pvalue -r"
[
.B options
]
[
.B file1
[
.B "file2 file3"
]
]
.SH DESCRIPTION
.I Pvalue
converts the pixels of a RADIANCE picture to or from another format.
In the default mode, pixels are sent to the
standard output, one per line, in the following ascii format:

        xpos    ypos    red     green   blue

If no
.I file
is given, the standard input is read.
.PP
The reverse conversion option
.I (-r)
may be used with a single input file or when reading from the
standard input, but if the second form is used with three separate
input files, the three primaries are presumed to be separated in
these files.
.TP 10n
.BR \-u
Print only unique values in the output, skipping runs of equal pixels.
Specifying
.I \+u
turns this option off, which is the default.
.TP
.BR \-o
Print original values, before exposure compensation.
If the input file is in XYZE format, the Y (green) channel
will correspond to units of candelas/meter^2.
Otherwise, the RGB values should be in spectral watts/steradian/meter^2.
Specifying
.I \+o
uses final exposed values, which is the default.
.TP
.BR \-h
Do not print header.
Specifying
.I \+h
causes the header to be printed, which is the default.
.TP
.BI \-H
Do not print the resolution string.
(See also the
.I \-r
option below.)
Specifying an input resolution for reverse conversion also turns
this option off.
Specifying
.I \+H
causes the resolution string to be printed, which is the default.
.TP
.BI \-s \ nbytes
Skip the specified number of bytes on the input header.
This option is useful for skipping unintelligible headers in
foreign file formats.
(Does not work when reading from standard input.)
.TP
.BI \-e \ exposure
Adjust the exposure by the amount specified.
If the exposure is being given as a conversion factor, use
.I \+e
instead, so an EXPOSURE line will not be recorded in the header
(if any).
.TP
.BI \-g \ gamma
Set gamma correction for conversion.
When converting from a RADIANCE picture to another format,
the inverse gamma is applied to correct for monitor response.
When converting to a RADIANCE picture
.I (\-r
option), the gamma is applied directly to recover the linear values.
By default,
.I gamma
is set to 1.0, meaning no gamma correction is performed.
.TP
.BR \-d
Data only,
do not print x and y pixel position.
.TP
.BR \-da
Same as
.I \-d.
.TP
.BR \-di
Print ascii integer values from 0 to 255+.
If
.I \+di
is given, the integer values will be preceded by
the x and y pixel locations.
.TP
.BR \-db
Output binary byte values from 0 to 255.
.TP
.BR \-dw
Output binary 16-bit words from 0 to 65535.
.TP
.BR \-dW
Output binary 16-bit words from 0 to 65535, byte-swapped.
.TP
.BR \-df
Output binary float values.
.TP
.BR \-dF
Output byte-swapped binary float values.
.TP
.BR \-dd
Output binary double values.
.TP
.BR \-dD
Output byte-swapped binary double values.
.TP
.BR \-R
Reverse ordering of colors so that the output is blue then green
then red.
The default ordering (specified with
.I \+R)
is red then green then blue.
.TP
.BR \-n
The RGB values are non-interleaved, meaning that all the red, green
and blue data are stored together in separate chunks.
Interleaving may be turned on with the
.I \+n
option, which is the default.
.TP
.BR \-b
Print brightness values rather than RGB.
Specifying
.I \+b
turns this option off, which is the default.
.TP
.BI \-p P
Put out only the primary
.I P,
where
.I P
is one of upper or lower case 'R', 'G' or 'B' for red, green or
blue, respectively.
This option may be used to separate the Radiance primaries into
three files with three separate runs of
.I pvalue,
or only one file when only one primary is needed.
Note that there is no space between this option and its argument.
.TP
.BR \-r
Perform reverse conversion.
Input is in the format given by the other options.
The x and y resolution must be specified on the command line, unless
the image file contains a Radiance resolution string at the
beginning (see 
.I \-H
option above and
.I \-y
option below).
Specifying
.I \+r
converts from a Radiance picture to other values, which is the
default.
.TP
.BI \-p " xr yr xg yg xb yb xw yw"
On reverse conversion, RGB input uses the given set of color primaries.
These are written into the output header with the PRIMARIES variable.
.TP
.BR \-pXYZ
On reverse conversion, input is in CIE XYZ coordinates, rather than RGB.
The Y channel is assumed to be in candelas/meter^2.
.TP
.BI -y \ res
Set the output y resolution to
.I res.
If
.I \+y
is specified, then the scanlines are assumed to be in
increasing order (ie. bottom to top).
The default value for this option is 0, which means
that the picture size and scanline order must appear
as the first line after the header (if any) in the
input file.
Either an upper or lower case 'Y' may be used for this option.
Since Radiance files always contain such a line, 
this option has no effect for forward conversions.
.TP
.BI +x \ res
Set the output x resolution to
.I res.
If
.I \-x
is specified, then the scanlines are assumed to be in
decreasing order (ie. right to left).
The ordering of the
.I \-y
and
.I \+x
options determines whether the scanlines are sorted along
x or along y.
Most Radiance pictures are sorted top to bottom, then left
to right.
This corresponds to a specification of the form "\-y yres +x xres".
Either an upper or lower case 'X' may be used for this option.
Like the
.I \-y
option,
.I \-x
options have no effect for forward conversions.
.SH EXAMPLE
To look at the original, unique pixels in picture:
.IP "" .2i
pvalue \-o \-u picture | more
.PP
To convert from a 512x400 8-bit greyscale image in bottom to top,
left to right scanline ordering:
.IP "" .2i
pvalue \-r \-db \-b \-h +y 400 +x 512 input.im > flipped.hdr
.br
pflip \-v flipped.hdr > final.hdr
.SH AUTHOR
Greg Ward
.SH BUGS
The
.I \-r
option does not work with the
.I \-u
option.
Also, input pixel locations are ignored during a reverse
conversion, so this information is not used in determining
the scanline ordering or picture size.
.SH "SEE ALSO"
getinfo(1), pcompos(1), pfilt(1), pflip(1),
protate(1), ra_xyze(1), rpict(1), rtrace(1), rvu(1)
Revision:	1.8
Committed:	Thu Dec 16 21:34:41 2010 UTC (14 years, 4 months ago) by greg
Branch:	MAIN
CVS Tags:	rad5R2, rad4R2P2, rad5R0, rad5R1, rad4R2, rad4R1, rad4R2P1
Changes since 1.7:	+10 -2 lines
Log Message:	Added recording of other color spaces to pvalue -r conversion
#	User	Rev	Content
1	greg	1.8	.\" RCSid "$Id: pvalue.1,v 1.7 2008/11/10 19:08:17 greg Exp $"
2	greg	1.1	.TH PVALUE 1 1/15/99 RADIANCE
3			.SH NAME
4			pvalue - convert RADIANCE picture to/from alternate formats
5			.SH SYNOPSIS
6			.B pvalue
7			[
8			.B options
9			]
10			[
11			.B file
12			]
13			.br
14			.B "pvalue -r"
15			[
16			.B options
17			]
18			[
19			.B file1
20			[
21			.B "file2 file3"
22			]
23			]
24			.SH DESCRIPTION
25			.I Pvalue
26			converts the pixels of a RADIANCE picture to or from another format.
27			In the default mode, pixels are sent to the
28			standard output, one per line, in the following ascii format:
29
30			xpos ypos red green blue
31
32			If no
33			.I file
34			is given, the standard input is read.
35			.PP
36			The reverse conversion option
37			.I (-r)
38			may be used with a single input file or when reading from the
39			standard input, but if the second form is used with three separate
40			input files, the three primaries are presumed to be separated in
41			these files.
42			.TP 10n
43			.BR \-u
44			Print only unique values in the output, skipping runs of equal pixels.
45			Specifying
46			.I \+u
47			turns this option off, which is the default.
48			.TP
49			.BR \-o
50			Print original values, before exposure compensation.
51	greg	1.5	If the input file is in XYZE format, the Y (green) channel
52			will correspond to units of candelas/meter^2.
53			Otherwise, the RGB values should be in spectral watts/steradian/meter^2.
54	greg	1.1	Specifying
55			.I \+o
56	greg	1.5	uses final exposed values, which is the default.
57	greg	1.1	.TP
58			.BR \-h
59			Do not print header.
60			Specifying
61			.I \+h
62			causes the header to be printed, which is the default.
63			.TP
64			.BI \-H
65			Do not print the resolution string.
66			(See also the
67			.I \-r
68			option below.)
69			Specifying an input resolution for reverse conversion also turns
70			this option off.
71			Specifying
72			.I \+H
73			causes the resolution string to be printed, which is the default.
74			.TP
75			.BI \-s \ nbytes
76			Skip the specified number of bytes on the input header.
77			This option is useful for skipping unintelligible headers in
78			foreign file formats.
79			(Does not work when reading from standard input.)
80			.TP
81			.BI \-e \ exposure
82			Adjust the exposure by the amount specified.
83			If the exposure is being given as a conversion factor, use
84			.I \+e
85			instead, so an EXPOSURE line will not be recorded in the header
86			(if any).
87			.TP
88			.BI \-g \ gamma
89			Set gamma correction for conversion.
90			When converting from a RADIANCE picture to another format,
91			the inverse gamma is applied to correct for monitor response.
92			When converting to a RADIANCE picture
93			.I (\-r
94			option), the gamma is applied directly to recover the linear values.
95			By default,
96			.I gamma
97			is set to 1.0, meaning no gamma correction is performed.
98			.TP
99			.BR \-d
100			Data only,
101			do not print x and y pixel position.
102			.TP
103			.BR \-da
104			Same as
105			.I \-d.
106			.TP
107			.BR \-di
108			Print ascii integer values from 0 to 255+.
109			If
110			.I \+di
111			is given, the integer values will be preceded by
112			the x and y pixel locations.
113			.TP
114			.BR \-db
115			Output binary byte values from 0 to 255.
116			.TP
117			.BR \-dw
118			Output binary 16-bit words from 0 to 65535.
119			.TP
120			.BR \-dW
121			Output binary 16-bit words from 0 to 65535, byte-swapped.
122			.TP
123			.BR \-df
124			Output binary float values.
125			.TP
126	greg	1.2	.BR \-dF
127			Output byte-swapped binary float values.
128			.TP
129	greg	1.1	.BR \-dd
130			Output binary double values.
131	greg	1.2	.TP
132			.BR \-dD
133			Output byte-swapped binary double values.
134	greg	1.1	.TP
135			.BR \-R
136			Reverse ordering of colors so that the output is blue then green
137			then red.
138			The default ordering (specified with
139			.I \+R)
140			is red then green then blue.
141			.TP
142			.BR \-n
143			The RGB values are non-interleaved, meaning that all the red, green
144			and blue data are stored together in separate chunks.
145			Interleaving may be turned on with the
146			.I \+n
147			option, which is the default.
148			.TP
149			.BR \-b
150			Print brightness values rather than RGB.
151			Specifying
152			.I \+b
153			turns this option off, which is the default.
154			.TP
155			.BI \-p P
156			Put out only the primary
157			.I P,
158			where
159			.I P
160			is one of upper or lower case 'R', 'G' or 'B' for red, green or
161			blue, respectively.
162			This option may be used to separate the Radiance primaries into
163			three files with three separate runs of
164			.I pvalue,
165			or only one file when only one primary is needed.
166			Note that there is no space between this option and its argument.
167			.TP
168			.BR \-r
169			Perform reverse conversion.
170			Input is in the format given by the other options.
171			The x and y resolution must be specified on the command line, unless
172			the image file contains a Radiance resolution string at the
173			beginning (see
174			.I \-H
175			option above and
176			.I \-y
177			option below).
178			Specifying
179			.I \+r
180			converts from a Radiance picture to other values, which is the
181			default.
182			.TP
183	greg	1.8	.BI \-p " xr yr xg yg xb yb xw yw"
184			On reverse conversion, RGB input uses the given set of color primaries.
185			These are written into the output header with the PRIMARIES variable.
186			.TP
187			.BR \-pXYZ
188			On reverse conversion, input is in CIE XYZ coordinates, rather than RGB.
189			The Y channel is assumed to be in candelas/meter^2.
190			.TP
191	greg	1.1	.BI -y \ res
192			Set the output y resolution to
193			.I res.
194			If
195			.I \+y
196			is specified, then the scanlines are assumed to be in
197			increasing order (ie. bottom to top).
198			The default value for this option is 0, which means
199			that the picture size and scanline order must appear
200			as the first line after the header (if any) in the
201			input file.
202			Either an upper or lower case 'Y' may be used for this option.
203			Since Radiance files always contain such a line,
204			this option has no effect for forward conversions.
205			.TP
206			.BI +x \ res
207			Set the output x resolution to
208			.I res.
209			If
210			.I \-x
211			is specified, then the scanlines are assumed to be in
212			decreasing order (ie. right to left).
213			The ordering of the
214			.I \-y
215			and
216			.I \+x
217			options determines whether the scanlines are sorted along
218			x or along y.
219			Most Radiance pictures are sorted top to bottom, then left
220			to right.
221	greg	1.6	This corresponds to a specification of the form "\-y yres +x xres".
222	greg	1.1	Either an upper or lower case 'X' may be used for this option.
223			Like the
224			.I \-y
225			option,
226			.I \-x
227			options have no effect for forward conversions.
228			.SH EXAMPLE
229			To look at the original, unique pixels in picture:
230			.IP "" .2i
231	greg	1.6	pvalue \-o \-u picture \| more
232	greg	1.1	.PP
233			To convert from a 512x400 8-bit greyscale image in bottom to top,
234			left to right scanline ordering:
235			.IP "" .2i
236	greg	1.7	pvalue \-r \-db \-b \-h +y 400 +x 512 input.im > flipped.hdr
237	greg	1.1	.br
238	greg	1.7	pflip \-v flipped.hdr > final.hdr
239	greg	1.1	.SH AUTHOR
240			Greg Ward
241			.SH BUGS
242			The
243			.I \-r
244			option does not work with the
245			.I \-u
246			option.
247			Also, input pixel locations are ignored during a reverse
248			conversion, so this information is not used in determining
249			the scanline ordering or picture size.
250			.SH "SEE ALSO"
251			getinfo(1), pcompos(1), pfilt(1), pflip(1),
252	greg	1.8	protate(1), ra_xyze(1), rpict(1), rtrace(1), rvu(1)