man/man1/normtiff.1

.TH NORMTIFF 1 2/25/99 RADIANCE
.SH NAME
normtiff - tone-map and convert RADIANCE picture or HDR TIFF to standard TIFF
.SH SYNOPSIS
.B normtiff
[
.B options
]
.B input
.B output.tif
.SH DESCRIPTION
.I Normtiff
prepares a Radiance picture or high dynamic-range TIFF
for output to a display or hard copy device.
If the dynamic range of the scene exceeds that of the display (as is
usually the case),
.I normtiff
will compress the dynamic range of the picture such that both
dark and bright regions are visible.
In addition, certain limitations in human vision may be mimicked in
order to provide an appearance similar to the experience one might
have in the actual scene.
.PP
Output is always an uncompressed RGB TIFF, which must be named
on the command line along with the input file.
If the input file has a ".tif" or ".tiff" extension,
.I normtiff
attempts to read it as a TIFF.
Otherwise,
.I normtiff
first tries opening it as a RADIANCE picture, only opening it
as a TIFF if it fails header inspection.
(See the
.I getinfo(1)
program.)\0
If the input is neither a RADIANCE picture nor a high dynamic-range TIFF,
the program reports an error and exits.
.PP
The following command line options are understood.
Since this program is very similar to
.I pcond(1),
several of the switches are identical.
.TP 10n
.BR -b
Toggle 8-bit black and white (grayscale) TIFF output.
If the input is a grayscale TIFF, this switch is
automatically selected.
Otherwise, the output defaults to 24-bit RGB.
.TP
.BR -h
Mimic human visual response in the output.
The goal of this process is to produce output that correlates
strongly with a person's subjective impression of a scene.
This switch turns on both the
.I \-s
and
.I \-c
switches, described below.
.TP
.BR -s
Toggle the use of the human contrast sensitivity function in determining the
exposure for the image.
A darker scene will have relatively lower exposure with lower
contrast than a well-lit scene.
.TP
.BR -c
Toggle mesopic color correction.
If parts of the image are in the mesopic or scotopic range where
the cone photoreceptors lose their efficiency, this switch will
cause a corresponding loss of color visibility in the output and a
shift to a scotopic (blue-dominant) response function.
.TP
.BR -l
Toggle the use of a linear response function versus the standard dynamic
range compression algorithm.
This may make some parts of the resulting image too
dark or too bright to see.
.TP
.BI -u \ Ldmax
Specifies the top of the luminance range for the target output device.
That is, the luminance (in candelas/m^2) for an output pixel value
of (R,G,B)=(255,255,255).
This parameter affects tone mapping only when the
.I \-s
switch is on.
The default value is 100 cd/m^2.
.TP
.BI -d \ Lddyn
Specifies the dynamic range for the target output device, which is
the ratio of the maximum and minimum usable display luminances.
The default value is 32, which is typical for CRT monitors.
.TP
.BI -p " xr yr xg yg xb yb xw yw"
Specifies the RGB primaries for the target output device.
These are the 1931 CIE (x,y) chromaticity values for red, green,
blue and white, respectively.
.TP
.BI -g \ gamma
Specifies the output device gamma correction value.
The default value is 2.2, which is appropriate for most CRT monitors.
(A value of 1.8 is common in color prepress and color printers.)\0
.SH EXAMPLES
To convert a RADIANCE picture to an 8-bit grayscale TIFF:
.IP "" .2i
normtiff -b scene.pic sceneb.tif
.PP
To condition a high dynamic-range TIFF for a particular film recorder with
known color primaries, dynamic range and gamma response:
.IP "" .2i
pcond -d 50 -g 2.5 -p .580 .340 .281 .570 .153 .079 .333 .333 orig.tif filmrgb.tif
.PP
To simulate human visual response on a monitor with known maximum luminance:
.IP "" .2i
normtiff -h -u 80 scene.pic sceneh.tif
.SH REFERENCE
Greg Ward Larson, Holly Rushmeier, Christine Piatko,
``A Visibility Matching Tone Reproduction Operator for High Dynamic Range
Scenes,''
.I "IEEE Transactions on Visualization and Computer Graphics",
December 1997.
.PP
http://positron.cs.berkeley.edu/gwlarson/pixformat/
.SH AUTHOR
Greg Ward Larson
.SH ACKNOWLEDGMENT
This work was supported by Silicon Graphics, Inc.
.SH "SEE ALSO"
getinfo(1), pcond(1), pflip(1), 
pvalue(1), protate(1), ra_xyze(1), rpict(1), ximage(1)
Revision:	1.2
Committed:	Mon Jul 14 04:56:53 2003 UTC (22 years, 3 months ago) by greg
Branch:	MAIN
CVS Tags:	rad3R6, rad3R6P1
Changes since 1.1:	+5 -5 lines
Log Message:	Added tone-mapping support for 16-bit/sample int and IEEE float TIFF images
#	User	Rev	Content
1	greg	1.1	.TH NORMTIFF 1 2/25/99 RADIANCE
2			.SH NAME
3	greg	1.2	normtiff - tone-map and convert RADIANCE picture or HDR TIFF to standard TIFF
4	greg	1.1	.SH SYNOPSIS
5			.B normtiff
6			[
7			.B options
8			]
9			.B input
10			.B output.tif
11			.SH DESCRIPTION
12			.I Normtiff
13	greg	1.2	prepares a Radiance picture or high dynamic-range TIFF
14	greg	1.1	for output to a display or hard copy device.
15			If the dynamic range of the scene exceeds that of the display (as is
16			usually the case),
17			.I normtiff
18			will compress the dynamic range of the picture such that both
19			dark and bright regions are visible.
20			In addition, certain limitations in human vision may be mimicked in
21			order to provide an appearance similar to the experience one might
22			have in the actual scene.
23			.PP
24			Output is always an uncompressed RGB TIFF, which must be named
25			on the command line along with the input file.
26			If the input file has a ".tif" or ".tiff" extension,
27			.I normtiff
28			attempts to read it as a TIFF.
29			Otherwise,
30			.I normtiff
31			first tries opening it as a RADIANCE picture, only opening it
32			as a TIFF if it fails header inspection.
33			(See the
34			.I getinfo(1)
35			program.)\0
36	greg	1.2	If the input is neither a RADIANCE picture nor a high dynamic-range TIFF,
37	greg	1.1	the program reports an error and exits.
38			.PP
39			The following command line options are understood.
40			Since this program is very similar to
41			.I pcond(1),
42			several of the switches are identical.
43			.TP 10n
44			.BR -b
45			Toggle 8-bit black and white (grayscale) TIFF output.
46	greg	1.2	If the input is a grayscale TIFF, this switch is
47	greg	1.1	automatically selected.
48			Otherwise, the output defaults to 24-bit RGB.
49			.TP
50			.BR -h
51			Mimic human visual response in the output.
52			The goal of this process is to produce output that correlates
53			strongly with a person's subjective impression of a scene.
54			This switch turns on both the
55			.I \-s
56			and
57			.I \-c
58			switches, described below.
59			.TP
60			.BR -s
61			Toggle the use of the human contrast sensitivity function in determining the
62			exposure for the image.
63			A darker scene will have relatively lower exposure with lower
64			contrast than a well-lit scene.
65			.TP
66			.BR -c
67			Toggle mesopic color correction.
68			If parts of the image are in the mesopic or scotopic range where
69			the cone photoreceptors lose their efficiency, this switch will
70			cause a corresponding loss of color visibility in the output and a
71			shift to a scotopic (blue-dominant) response function.
72			.TP
73			.BR -l
74			Toggle the use of a linear response function versus the standard dynamic
75			range compression algorithm.
76			This may make some parts of the resulting image too
77			dark or too bright to see.
78			.TP
79			.BI -u \ Ldmax
80			Specifies the top of the luminance range for the target output device.
81			That is, the luminance (in candelas/m^2) for an output pixel value
82			of (R,G,B)=(255,255,255).
83			This parameter affects tone mapping only when the
84			.I \-s
85			switch is on.
86			The default value is 100 cd/m^2.
87			.TP
88			.BI -d \ Lddyn
89			Specifies the dynamic range for the target output device, which is
90			the ratio of the maximum and minimum usable display luminances.
91			The default value is 32, which is typical for CRT monitors.
92			.TP
93			.BI -p " xr yr xg yg xb yb xw yw"
94			Specifies the RGB primaries for the target output device.
95			These are the 1931 CIE (x,y) chromaticity values for red, green,
96			blue and white, respectively.
97			.TP
98			.BI -g \ gamma
99			Specifies the output device gamma correction value.
100			The default value is 2.2, which is appropriate for most CRT monitors.
101			(A value of 1.8 is common in color prepress and color printers.)\0
102			.SH EXAMPLES
103			To convert a RADIANCE picture to an 8-bit grayscale TIFF:
104			.IP "" .2i
105			normtiff -b scene.pic sceneb.tif
106			.PP
107	greg	1.2	To condition a high dynamic-range TIFF for a particular film recorder with
108	greg	1.1	known color primaries, dynamic range and gamma response:
109			.IP "" .2i
110			pcond -d 50 -g 2.5 -p .580 .340 .281 .570 .153 .079 .333 .333 orig.tif filmrgb.tif
111			.PP
112			To simulate human visual response on a monitor with known maximum luminance:
113			.IP "" .2i
114			normtiff -h -u 80 scene.pic sceneh.tif
115			.SH REFERENCE
116			Greg Ward Larson, Holly Rushmeier, Christine Piatko,
117			``A Visibility Matching Tone Reproduction Operator for High Dynamic Range
118			Scenes,''
119			.I "IEEE Transactions on Visualization and Computer Graphics",
120			December 1997.
121			.PP
122			http://positron.cs.berkeley.edu/gwlarson/pixformat/
123			.SH AUTHOR
124			Greg Ward Larson
125			.SH ACKNOWLEDGMENT
126			This work was supported by Silicon Graphics, Inc.
127			.SH "SEE ALSO"
128			getinfo(1), pcond(1), pflip(1),
129			pvalue(1), protate(1), ra_xyze(1), rpict(1), ximage(1)