man/man1/pvalue.1

.\" RCSid "$Id: pvalue.1,v 1.10 2019/07/15 23:42:44 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.
For reverse conversions, the
.I \-u
option writes uncompressed output rather than the standard run-length RGBE
encoding.
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.
.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
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:	1.11
Committed:	Thu Jul 18 14:45:59 2019 UTC (4 years, 11 months ago) by greg
Branch:	MAIN
CVS Tags:	rad5R3
Changes since 1.10:	+2 -7 lines
Log Message:	Removed note about -r not working with -u, since we repurposed it
#	User	Rev	Content
1	greg	1.11	.\" RCSid "$Id: pvalue.1,v 1.10 2019/07/15 23:42:44 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	greg	1.9	For reverse conversions, the
46			.I \-u
47			option writes uncompressed output rather than the standard run-length RGBE
48			encoding.
49	greg	1.1	Specifying
50			.I \+u
51			turns this option off, which is the default.
52			.TP
53			.BR \-o
54			Print original values, before exposure compensation.
55	greg	1.5	If the input file is in XYZE format, the Y (green) channel
56			will correspond to units of candelas/meter^2.
57			Otherwise, the RGB values should be in spectral watts/steradian/meter^2.
58	greg	1.1	Specifying
59			.I \+o
60	greg	1.5	uses final exposed values, which is the default.
61	greg	1.1	.TP
62			.BR \-h
63			Do not print header.
64			Specifying
65			.I \+h
66			causes the header to be printed, which is the default.
67			.TP
68			.BI \-H
69			Do not print the resolution string.
70			(See also the
71			.I \-r
72			option below.)
73			Specifying an input resolution for reverse conversion also turns
74			this option off.
75			Specifying
76			.I \+H
77			causes the resolution string to be printed, which is the default.
78			.TP
79			.BI \-s \ nbytes
80			Skip the specified number of bytes on the input header.
81			This option is useful for skipping unintelligible headers in
82			foreign file formats.
83			.TP
84			.BI \-e \ exposure
85			Adjust the exposure by the amount specified.
86			If the exposure is being given as a conversion factor, use
87			.I \+e
88			instead, so an EXPOSURE line will not be recorded in the header
89			(if any).
90			.TP
91			.BI \-g \ gamma
92			Set gamma correction for conversion.
93			When converting from a RADIANCE picture to another format,
94			the inverse gamma is applied to correct for monitor response.
95			When converting to a RADIANCE picture
96			.I (\-r
97			option), the gamma is applied directly to recover the linear values.
98			By default,
99			.I gamma
100			is set to 1.0, meaning no gamma correction is performed.
101			.TP
102			.BR \-d
103			Data only,
104			do not print x and y pixel position.
105			.TP
106			.BR \-da
107			Same as
108			.I \-d.
109			.TP
110			.BR \-di
111			Print ascii integer values from 0 to 255+.
112			If
113			.I \+di
114			is given, the integer values will be preceded by
115			the x and y pixel locations.
116			.TP
117			.BR \-db
118			Output binary byte values from 0 to 255.
119			.TP
120			.BR \-dw
121			Output binary 16-bit words from 0 to 65535.
122			.TP
123			.BR \-dW
124			Output binary 16-bit words from 0 to 65535, byte-swapped.
125			.TP
126			.BR \-df
127			Output binary float values.
128			.TP
129	greg	1.2	.BR \-dF
130			Output byte-swapped binary float values.
131			.TP
132	greg	1.1	.BR \-dd
133			Output binary double values.
134	greg	1.2	.TP
135			.BR \-dD
136			Output byte-swapped binary double values.
137	greg	1.1	.TP
138			.BR \-R
139			Reverse ordering of colors so that the output is blue then green
140			then red.
141			The default ordering (specified with
142			.I \+R)
143			is red then green then blue.
144			.TP
145			.BR \-n
146			The RGB values are non-interleaved, meaning that all the red, green
147			and blue data are stored together in separate chunks.
148			Interleaving may be turned on with the
149			.I \+n
150			option, which is the default.
151			.TP
152			.BR \-b
153			Print brightness values rather than RGB.
154			Specifying
155			.I \+b
156			turns this option off, which is the default.
157			.TP
158			.BI \-p P
159			Put out only the primary
160			.I P,
161			where
162			.I P
163			is one of upper or lower case 'R', 'G' or 'B' for red, green or
164			blue, respectively.
165			This option may be used to separate the Radiance primaries into
166			three files with three separate runs of
167			.I pvalue,
168			or only one file when only one primary is needed.
169			Note that there is no space between this option and its argument.
170			.TP
171			.BR \-r
172			Perform reverse conversion.
173			Input is in the format given by the other options.
174			The x and y resolution must be specified on the command line, unless
175			the image file contains a Radiance resolution string at the
176			beginning (see
177			.I \-H
178			option above and
179			.I \-y
180			option below).
181			Specifying
182			.I \+r
183			converts from a Radiance picture to other values, which is the
184			default.
185			.TP
186	greg	1.8	.BI \-p " xr yr xg yg xb yb xw yw"
187			On reverse conversion, RGB input uses the given set of color primaries.
188			These are written into the output header with the PRIMARIES variable.
189			.TP
190			.BR \-pXYZ
191			On reverse conversion, input is in CIE XYZ coordinates, rather than RGB.
192			The Y channel is assumed to be in candelas/meter^2.
193			.TP
194	greg	1.1	.BI -y \ res
195			Set the output y resolution to
196			.I res.
197			If
198			.I \+y
199			is specified, then the scanlines are assumed to be in
200			increasing order (ie. bottom to top).
201			The default value for this option is 0, which means
202			that the picture size and scanline order must appear
203			as the first line after the header (if any) in the
204			input file.
205			Either an upper or lower case 'Y' may be used for this option.
206			Since Radiance files always contain such a line,
207			this option has no effect for forward conversions.
208			.TP
209			.BI +x \ res
210			Set the output x resolution to
211			.I res.
212			If
213			.I \-x
214			is specified, then the scanlines are assumed to be in
215			decreasing order (ie. right to left).
216			The ordering of the
217			.I \-y
218			and
219			.I \+x
220			options determines whether the scanlines are sorted along
221			x or along y.
222			Most Radiance pictures are sorted top to bottom, then left
223			to right.
224	greg	1.6	This corresponds to a specification of the form "\-y yres +x xres".
225	greg	1.1	Either an upper or lower case 'X' may be used for this option.
226			Like the
227			.I \-y
228			option,
229			.I \-x
230			options have no effect for forward conversions.
231			.SH EXAMPLE
232			To look at the original, unique pixels in picture:
233			.IP "" .2i
234	greg	1.6	pvalue \-o \-u picture \| more
235	greg	1.1	.PP
236			To convert from a 512x400 8-bit greyscale image in bottom to top,
237			left to right scanline ordering:
238			.IP "" .2i
239	greg	1.7	pvalue \-r \-db \-b \-h +y 400 +x 512 input.im > flipped.hdr
240	greg	1.1	.br
241	greg	1.7	pflip \-v flipped.hdr > final.hdr
242	greg	1.1	.SH AUTHOR
243			Greg Ward
244			.SH BUGS
245	greg	1.11	Input pixel locations are ignored during a reverse
246	greg	1.1	conversion, so this information is not used in determining
247			the scanline ordering or picture size.
248			.SH "SEE ALSO"
249			getinfo(1), pcompos(1), pfilt(1), pflip(1),
250	greg	1.8	protate(1), ra_xyze(1), rpict(1), rtrace(1), rvu(1)