Mercurial > octave
annotate scripts/image/brighten.m @ 26376:00f796120a6d stable
maint: Update copyright dates in all source files.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Wed, 02 Jan 2019 16:32:43 -0500 |
parents | 6652d3823428 |
children | b442ec6dda5c |
rev | line source |
---|---|
26376
00f796120a6d
maint: Update copyright dates in all source files.
John W. Eaton <jwe@octave.org>
parents:
25054
diff
changeset
|
1 ## Copyright (C) 1999-2019 Kai Habel |
6788 | 2 ## |
3 ## This file is part of Octave. | |
4 ## | |
24534
194eb4bd202b
maint: Update punctuation for GPL v3 license text.
Rik <rik@octave.org>
parents:
24423
diff
changeset
|
5 ## Octave is free software: you can redistribute it and/or modify it |
6788 | 6 ## under the terms of the GNU General Public License as published by |
24534
194eb4bd202b
maint: Update punctuation for GPL v3 license text.
Rik <rik@octave.org>
parents:
24423
diff
changeset
|
7 ## the Free Software Foundation, either version 3 of the License, or |
22755
3a2b891d0b33
maint: Standardize Copyright formatting.
Rik <rik@octave.org>
parents:
22323
diff
changeset
|
8 ## (at your option) any later version. |
6788 | 9 ## |
10 ## Octave is distributed in the hope that it will be useful, but | |
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
22755
3a2b891d0b33
maint: Standardize Copyright formatting.
Rik <rik@octave.org>
parents:
22323
diff
changeset
|
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
3a2b891d0b33
maint: Standardize Copyright formatting.
Rik <rik@octave.org>
parents:
22323
diff
changeset
|
13 ## GNU General Public License for more details. |
6788 | 14 ## |
15 ## You should have received a copy of the GNU General Public License | |
7016 | 16 ## along with Octave; see the file COPYING. If not, see |
24534
194eb4bd202b
maint: Update punctuation for GPL v3 license text.
Rik <rik@octave.org>
parents:
24423
diff
changeset
|
17 ## <https://www.gnu.org/licenses/>. |
6788 | 18 |
19 ## -*- texinfo -*- | |
20852
516bb87ea72e
2015 Code Sprint: remove class of function from docstring for all m-files.
Rik <rik@octave.org>
parents:
20158
diff
changeset
|
20 ## @deftypefn {} {@var{map_out} =} brighten (@var{beta}) |
516bb87ea72e
2015 Code Sprint: remove class of function from docstring for all m-files.
Rik <rik@octave.org>
parents:
20158
diff
changeset
|
21 ## @deftypefnx {} {@var{map_out} =} brighten (@var{map}, @var{beta}) |
516bb87ea72e
2015 Code Sprint: remove class of function from docstring for all m-files.
Rik <rik@octave.org>
parents:
20158
diff
changeset
|
22 ## @deftypefnx {} {@var{map_out} =} brighten (@var{h}, @var{beta}) |
516bb87ea72e
2015 Code Sprint: remove class of function from docstring for all m-files.
Rik <rik@octave.org>
parents:
20158
diff
changeset
|
23 ## @deftypefnx {} {} brighten (@dots{}) |
20158
7503499a252b
doc: Update docstrings to have one sentence summary as first line.
Rik <rik@octave.org>
parents:
19697
diff
changeset
|
24 ## Brighten or darken a colormap. |
7503499a252b
doc: Update docstrings to have one sentence summary as first line.
Rik <rik@octave.org>
parents:
19697
diff
changeset
|
25 ## |
7503499a252b
doc: Update docstrings to have one sentence summary as first line.
Rik <rik@octave.org>
parents:
19697
diff
changeset
|
26 ## The argument @var{beta} must be a scalar between -1 and 1, where a negative |
7503499a252b
doc: Update docstrings to have one sentence summary as first line.
Rik <rik@octave.org>
parents:
19697
diff
changeset
|
27 ## value darkens and a positive value brightens the colormap. |
6788 | 28 ## |
20158
7503499a252b
doc: Update docstrings to have one sentence summary as first line.
Rik <rik@octave.org>
parents:
19697
diff
changeset
|
29 ## If the @var{map} argument is omitted, the function is applied to the current |
7503499a252b
doc: Update docstrings to have one sentence summary as first line.
Rik <rik@octave.org>
parents:
19697
diff
changeset
|
30 ## colormap. |
7503499a252b
doc: Update docstrings to have one sentence summary as first line.
Rik <rik@octave.org>
parents:
19697
diff
changeset
|
31 ## |
7503499a252b
doc: Update docstrings to have one sentence summary as first line.
Rik <rik@octave.org>
parents:
19697
diff
changeset
|
32 ## The first argument can also be a valid graphics handle @var{h}, in which |
7503499a252b
doc: Update docstrings to have one sentence summary as first line.
Rik <rik@octave.org>
parents:
19697
diff
changeset
|
33 ## case @code{brighten} is applied to the colormap associated with this handle. |
6788 | 34 ## |
21546
f7f97d7e9294
doc: Wrap m-file docstrings to 79 characters + newline (80 total).
Rik <rik@octave.org>
parents:
20852
diff
changeset
|
35 ## If no output is specified then the result is written to the current |
f7f97d7e9294
doc: Wrap m-file docstrings to 79 characters + newline (80 total).
Rik <rik@octave.org>
parents:
20852
diff
changeset
|
36 ## colormap. |
14260
1f911333ed3d
doc: Update docstrings for functions in image/ directory
Rik <octave@nomad.inbox5.com>
parents:
14138
diff
changeset
|
37 ## @seealso{colormap, contrast} |
6788 | 38 ## @end deftypefn |
39 | |
11469
c776f063fefe
Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents:
10793
diff
changeset
|
40 function rmap = brighten (arg1, beta) |
15683
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
41 |
15714
b1cd65881592
Clean up scripts in image directory.
Rik <rik@octave.org>
parents:
15683
diff
changeset
|
42 if (nargin < 1 || nargin > 2) |
b1cd65881592
Clean up scripts in image directory.
Rik <rik@octave.org>
parents:
15683
diff
changeset
|
43 print_usage (); |
b1cd65881592
Clean up scripts in image directory.
Rik <rik@octave.org>
parents:
15683
diff
changeset
|
44 endif |
b1cd65881592
Clean up scripts in image directory.
Rik <rik@octave.org>
parents:
15683
diff
changeset
|
45 |
6788 | 46 h = -1; |
47 if (nargin == 1) | |
11469
c776f063fefe
Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents:
10793
diff
changeset
|
48 beta = arg1; |
15714
b1cd65881592
Clean up scripts in image directory.
Rik <rik@octave.org>
parents:
15683
diff
changeset
|
49 m = colormap (); |
6788 | 50 h = gcf (); |
15714
b1cd65881592
Clean up scripts in image directory.
Rik <rik@octave.org>
parents:
15683
diff
changeset
|
51 else |
24423
1d52db450db4
Change ishandle to return true for Java objects for Matlab compatibility.
Rik <rik@octave.org>
parents:
23220
diff
changeset
|
52 if (ishghandle (arg1)) |
11469
c776f063fefe
Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents:
10793
diff
changeset
|
53 h = arg1; |
6788 | 54 m = get (h, "colormap"); |
15714
b1cd65881592
Clean up scripts in image directory.
Rik <rik@octave.org>
parents:
15683
diff
changeset
|
55 elseif (iscolormap (arg1)) |
11469
c776f063fefe
Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents:
10793
diff
changeset
|
56 m = arg1; |
c776f063fefe
Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents:
10793
diff
changeset
|
57 else |
15714
b1cd65881592
Clean up scripts in image directory.
Rik <rik@octave.org>
parents:
15683
diff
changeset
|
58 error ("brighten: first argument must be a colormap or a graphics handle"); |
6788 | 59 endif |
60 endif | |
61 | |
8507 | 62 if (! isscalar (beta) || beta <= -1 || beta >= 1) |
11472
1740012184f9
Use uppercase for variable names in error() strings to match Info documentation. Only m-files done.
Rik <octave@nomad.inbox5.com>
parents:
11469
diff
changeset
|
63 error ("brighten: BETA must be a scalar in the range (-1,1)"); |
6788 | 64 endif |
65 | |
66 if (beta > 0) | |
67 gamma = 1 - beta; | |
68 else | |
69 gamma = 1 / (1 + beta); | |
70 endif | |
71 | |
72 if (nargout == 0) | |
24423
1d52db450db4
Change ishandle to return true for Java objects for Matlab compatibility.
Rik <rik@octave.org>
parents:
23220
diff
changeset
|
73 if (ishghandle (h)) |
6788 | 74 set (h, "colormap", m .^ gamma); |
75 else | |
76 colormap (m .^ gamma); | |
77 endif | |
78 else | |
11469
c776f063fefe
Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents:
10793
diff
changeset
|
79 rmap = m .^ gamma; |
6788 | 80 endif |
81 | |
82 endfunction | |
15683
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
83 |
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
84 |
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
85 %!demo |
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
86 %! ## First figure uses default grayscale colormap |
21658
2f9078956a63
don't open new figures unnecessarily in demos
John W. Eaton <jwe@octave.org>
parents:
21546
diff
changeset
|
87 %! clf; |
15683
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
88 %! colormap (gray (64)); |
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
89 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); |
22151
283d8dfcad37
Make demos Matlab compatible for comparison with dump_demos script.
Rik <rik@octave.org>
parents:
21658
diff
changeset
|
90 %! axis ([1, 64, 0, 1], "xy"); |
283d8dfcad37
Make demos Matlab compatible for comparison with dump_demos script.
Rik <rik@octave.org>
parents:
21658
diff
changeset
|
91 %! set (gca, "xtick", []); |
15683
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
92 %! title ("default grayscale colormap"); |
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
93 %! pos = get (gcf, "position"); |
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
94 %! pos(1) += pos(3) + 25; |
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
95 %! ## Second figure uses brightened grayscale colormap |
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
96 %! figure ("position", pos); |
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
97 %! colormap (gray (64)); |
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
98 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64)); |
22151
283d8dfcad37
Make demos Matlab compatible for comparison with dump_demos script.
Rik <rik@octave.org>
parents:
21658
diff
changeset
|
99 %! axis ([1, 64, 0, 1], "xy"); |
283d8dfcad37
Make demos Matlab compatible for comparison with dump_demos script.
Rik <rik@octave.org>
parents:
21658
diff
changeset
|
100 %! set (gca, "xtick", []); |
15683
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
101 %! brighten (0.5); |
806ea52af230
Overhaul m-files in image directory to provide better support for images stored as integers.
Rik <rik@octave.org>
parents:
14260
diff
changeset
|
102 %! title ("grayscale colormap brightened by 0.5"); |