man/man1/falsecolor.1

.\" RCSid "$Id: falsecolor.1,v 1.4 2006/11/13 02:41:45 greg Exp $"
.TH FALSECOLOR 1 11/15/93 RADIANCE
.SH NAME
falsecolor - make a false color RADIANCE picture
.SH SYNOPSIS
.B falsecolor
[
.B "\-i input"
][
.B "\-p picture"
][
.B "\-cb | \-cl"
][
.B \-e
][
.B "\-s scale"
][
.B "\-l label"
][
.B "\-n ndivs"
][
.B "\-lw lwidth"
][
.B "\-lh lheight"
][
.B "\-log decades"
][
.B "\-m mult"
][
.B "\-spec"
][
.B "\-r redv"
][
.B "\-g grnv"
][
.B "\-b bluv"
]
.SH DESCRIPTION
.I Falsecolor
produces a false color picture for lighting analysis.
Input is a rendered Radiance picture.
.PP
By default, luminance is displayed on a linear scale from 0 to 1000 nits, where
dark areas are blue and brighter areas move through the spectrum to red.
A different scale can be given with the
.I \-s
option.
If the argument given to
.I \-s
begins with an "a" for "auto," then the maximum is used for scaling the result.
The default multiplier is 179, which converts from radiance or irradiance
to luminance or illuminance, respectively.
A different multiplier can be given with
.I \-m
to get daylight factors or whatever.
For a logarithmic rather than a linear mapping, the
.I \-log
option can be used, where
.I decades
is the number of decades below the maximum scale desired.
.PP
A legend is produced for the new image with a label given by the
.I \-l
option.
The default label is "Nits", which is appropriate for standard Radiance
images.
If the
.I -i
option of
.I rpict(1)
was used to produce the image, then the appropriate label would be "Lux".
.PP
If contour lines are desired rather than just false color, the
.I \-cl
option can be used.
These lines can be placed over another Radiance picture using the
.I -p
option.
If the input picture is given with
.I \-ip
instead of
.I \-i,
then it will be used both as the source of values and as the picture
to overlay with contours.
The
.I \-cb
option produces contour bands instead of lines, where the thickness of
the bands is related to the rate of change in the image.
The
.I \-n
option can be used to change the number of contours (and corresponding
legend entries) from the default value of 8.
The
.I \-lw
and
.I \-lh
options may be used to change the legend dimensions from the default width
and height of 100x200.
A value of zero in either eliminates the legend in the output.
.PP
The
.I \-e
option causes extrema points to be printed on the brightest and
darkest pixels of the input picture.
.PP
The
.I "\-spec"
option reinstates the old, spectral color scale used in the original
.I falsecolor.
The remaining options,
.I "\-r, \-g,"
and
.I \-b
are for changing the mapping of values to colors.
These are expressions of the variable 
.I v,
where
.I v
varies from 0 to 1.
These options are not recommended for the casual user.
.PP
If no
.I \-i
or
.I \-ip
option is used, input is taken from the standard input.
The output image is always written to standard output, which should
be redirected.
.SH EXAMPLES
To create a false color image directly from
.I rpict(1):
.IP "" .2i
rpict \-vf default.vp scene.oct | falsecolor > scene.pic
.PP
To create a logarithmic contour plot of illuminance values on a
Radiance image:
.IP "" .2i
rpict \-i \-vf default.vp scene.oct > irrad.pic
.br
rpict \-vf default.vp scene.oct > rad.pic
.br
falsecolor \-i irrad.pic \-p rad.pic \-cl \-log 2 \-l Lux > lux.pic
.SH AUTHOR
Greg Ward
.SH ACKNOWLEDGEMENT
Work on this program was initiated and sponsored by the LESO
group at EPFL in Switzerland.
.SH "SEE ALSO"
getinfo(1), pcomb(1), pcompos(1), pextrem(1), pfilt(1), pflip(1), protate(1),
psign(1), rpict(1), ximage(1)
Revision:	1.5
Committed:	Tue Sep 4 17:36:40 2007 UTC (18 years, 4 months ago) by greg
Branch:	MAIN
CVS Tags:	rad3R9
Changes since 1.4:	+5 -5 lines
Log Message:	Added backslashes in front of hyphens (thanks to Bernd Zeimetz for his effort)
#	User	Rev	Content
1	greg	1.5	.\" RCSid "$Id: falsecolor.1,v 1.4 2006/11/13 02:41:45 greg Exp $"
2	greg	1.1	.TH FALSECOLOR 1 11/15/93 RADIANCE
3			.SH NAME
4			falsecolor - make a false color RADIANCE picture
5			.SH SYNOPSIS
6			.B falsecolor
7			[
8			.B "\-i input"
9			][
10			.B "\-p picture"
11			][
12			.B "\-cb \| \-cl"
13			][
14			.B \-e
15			][
16			.B "\-s scale"
17			][
18			.B "\-l label"
19			][
20			.B "\-n ndivs"
21			][
22	greg	1.3	.B "\-lw lwidth"
23			][
24			.B "\-lh lheight"
25			][
26	greg	1.1	.B "\-log decades"
27			][
28			.B "\-m mult"
29			][
30	greg	1.4	.B "\-spec"
31			][
32	greg	1.1	.B "\-r redv"
33			][
34			.B "\-g grnv"
35			][
36			.B "\-b bluv"
37			]
38			.SH DESCRIPTION
39			.I Falsecolor
40			produces a false color picture for lighting analysis.
41			Input is a rendered Radiance picture.
42			.PP
43			By default, luminance is displayed on a linear scale from 0 to 1000 nits, where
44			dark areas are blue and brighter areas move through the spectrum to red.
45			A different scale can be given with the
46			.I \-s
47			option.
48	greg	1.4	If the argument given to
49			.I \-s
50			begins with an "a" for "auto," then the maximum is used for scaling the result.
51	greg	1.1	The default multiplier is 179, which converts from radiance or irradiance
52			to luminance or illuminance, respectively.
53			A different multiplier can be given with
54			.I \-m
55			to get daylight factors or whatever.
56			For a logarithmic rather than a linear mapping, the
57			.I \-log
58			option can be used, where
59			.I decades
60			is the number of decades below the maximum scale desired.
61			.PP
62			A legend is produced for the new image with a label given by the
63			.I \-l
64			option.
65			The default label is "Nits", which is appropriate for standard Radiance
66			images.
67			If the
68			.I -i
69			option of
70			.I rpict(1)
71			was used to produce the image, then the appropriate label would be "Lux".
72			.PP
73			If contour lines are desired rather than just false color, the
74			.I \-cl
75			option can be used.
76			These lines can be placed over another Radiance picture using the
77			.I -p
78			option.
79			If the input picture is given with
80			.I \-ip
81			instead of
82			.I \-i,
83			then it will be used both as the source of values and as the picture
84			to overlay with contours.
85			The
86			.I \-cb
87			option produces contour bands instead of lines, where the thickness of
88			the bands is related to the rate of change in the image.
89			The
90			.I \-n
91			option can be used to change the number of contours (and corresponding
92			legend entries) from the default value of 8.
93	greg	1.3	The
94			.I \-lw
95			and
96			.I \-lh
97			options may be used to change the legend dimensions from the default width
98			and height of 100x200.
99			A value of zero in either eliminates the legend in the output.
100	greg	1.1	.PP
101			The
102			.I \-e
103			option causes extrema points to be printed on the brightest and
104			darkest pixels of the input picture.
105			.PP
106	greg	1.4	The
107			.I "\-spec"
108			option reinstates the old, spectral color scale used in the original
109			.I falsecolor.
110	greg	1.1	The remaining options,
111			.I "\-r, \-g,"
112			and
113			.I \-b
114			are for changing the mapping of values to colors.
115			These are expressions of the variable
116			.I v,
117			where
118			.I v
119			varies from 0 to 1.
120			These options are not recommended for the casual user.
121			.PP
122			If no
123			.I \-i
124			or
125			.I \-ip
126			option is used, input is taken from the standard input.
127			The output image is always written to standard output, which should
128			be redirected.
129			.SH EXAMPLES
130			To create a false color image directly from
131			.I rpict(1):
132			.IP "" .2i
133	greg	1.5	rpict \-vf default.vp scene.oct \| falsecolor > scene.pic
134	greg	1.1	.PP
135			To create a logarithmic contour plot of illuminance values on a
136			Radiance image:
137			.IP "" .2i
138	greg	1.5	rpict \-i \-vf default.vp scene.oct > irrad.pic
139	greg	1.1	.br
140	greg	1.5	rpict \-vf default.vp scene.oct > rad.pic
141	greg	1.1	.br
142	greg	1.5	falsecolor \-i irrad.pic \-p rad.pic \-cl \-log 2 \-l Lux > lux.pic
143	greg	1.1	.SH AUTHOR
144			Greg Ward
145			.SH ACKNOWLEDGEMENT
146			Work on this program was initiated and sponsored by the LESO
147			group at EPFL in Switzerland.
148			.SH "SEE ALSO"
149			getinfo(1), pcomb(1), pcompos(1), pextrem(1), pfilt(1), pflip(1), protate(1),
150			psign(1), rpict(1), ximage(1)