1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
|
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<style type="text/css"><!--
@import url("../../www/magick.css");
//--></style>
<title>ImageMagick: MagickCore, C API for ImageMagick: Resize an Image</title>
<meta http-equiv="Content-Language" content="en-US" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="Reply-to" content="magick-users@imagemagick.org" />
<meta name="Generator" content="PHP" />
<meta name="Keywords" content="magickcore, c, api, for, imagemagick:, resize, an, image, ImageMagick, PerlMagick, Magick++, Image, Magick" />
<meta name="Description" content="ImageMagick (TM) is a free software suite to create, edit and compose bitmap images. It can read, convert and write images in a large variety of formats. Images can be cropped, colors can be changed, various effects can be applied, images can be rotated and combined, and text, lines, polygons, ellipses and Bézier curves can be added to images and stretched and rotated. ImageMagick is free software: it is delivered with full source code and can be freely used, copied, modified and distributed. Its license is compatible with the GPL. It runs on all major operating systems. Most of the functionality of ImageMagick can be used interactively from the command line; more often, however, the features are used from programs written in the programming languages Perl, C, C++, Python, PHP, Ruby or Java, for which ready-made ImageMagick interfaces (PerlMagick, Magick++, PythonMagick, MagickWand for PHP, RubyMagick, and JMagick) are available. This makes it possible to modify or create images automatically and dynamically. ImageMagick supports many image formats (over 90 major formats) including popular formats like TIFF, JPEG, PNG, PDF, PhotoCD, and GIF." />
<meta name="Rating" content="GENERAL" />
<meta name="Robots" content="ALL" />
<meta name="Generator" content="ImageMagick Studio LLC" />
<meta name="Author" content="ImageMagick Studio LLC" />
<meta name="Revisit-after" content="2 DAYS" />
<meta name="Resource-type" content="document" />
<meta name="Copyright" content="Copyright (c) 1999-2005 ImageMagick Studio LLC" />
<meta name="Distribution" content="Global" />
<link rel="shortcut icon" href="/../images/wand.ico" type="image/x-icon" />
</head>
<body id="www-imagemagick-org">
<table width="100%" id="titlebar" bgcolor="#f5f5f5" cellpadding="0" cellspacing="0" border="0" summary="ImageMagick">
<tbody>
<tr valign="top">
<td align="left"><a href="../../index.html"><img id="titlebar-west" src="../../images/script.png" alt="[ImageMagick]" width="202" height="118" border="0" name="titlebar-west" /></a></td>
<td width="35%"><br /></td>
<td align="left"><a href="http://www.imagemagick.org/" target="1078087962"><img id="titlebar-west" src="../../images/sponsor.jpg" alt="[sponsor]" border="0" vspace="28" name="titlebar-west" /></a></td>
<td width="65%"><br /></td>
<td bgcolor="white" align="right"><a href="../../index.html"><img src="../../images/sprite.jpg" alt="" width="114" height="118" border="0" name="titlebar-east" /></a></td>
<td bgcolor="white" align="right"><a href="../../index.html"><img id="titlebar-east" src="../../images/logo.jpg" alt="" width="114" height="118" border="0" name="titlebar-east" /></a></td>
</tr>
</tbody>
</table>
<table width="100%" border="0" cellpadding="0" cellspacing="0" summary="">
<tbody>
<tr valign="top" style="height: 100%;">
<td id="menu" width="1%" height="100%">
<p><a href="#main">Skip to page contents</a></p>
<span>[</span>
<a href="../../index.html">About ImageMagick</a>
<a href="../../www/command-line-tools.html">Command-line Tools</a>
<a href="../../www/api.html">Program Interfaces</a>
<span>]</span><br /><span>[</span>
<a href="../../www/install-source.html">Install from Source</a>
<a href="../../www/binary-releases.html">Binary Releases</a>
<a href="../../www/resources.html">Resources</a>
<span>]</span><br /><span>[</span>
<a href="../../www/download.html">Download</a>
<span>]</span><br /><span>[</span>
<a href="../../www/links.html">Links</a>
<span>]</span><br /><br /><span>[</span>
<a href="../../www/sponsors.html">Sponsors</a>
<a href="http://www.weikatec.com" class="sponsor" target="sponsor">Solutions for e- and<br />m-commerce</a><!-- 20050808 -->
<span>]</span>
</td>
<td id="main" valign="top">
<p class="navigation-index">[ <a href="#MagnifyImage">MagnifyImage</a> | <a href="#MinifyImage">MinifyImage</a> | <a href="#ResizeImage">ResizeImage</a> | <a href="#SampleImage">SampleImage</a> | <a href="#ScaleImage">ScaleImage</a> | <a href="#ThumbnailImage">ThumbnailImage</a> ]</p>
<div style="margin: auto;">
<h2><a name="MagnifyImage">MagnifyImage</a></h2>
</div>
<p>MagnifyImage() is a convenience method that scales an image proportionally to twice its size.</p>
<p>The format of the MagnifyImage method is:</p>
<pre class="code">
Image *MagnifyImage(const Image *image,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="MinifyImage">MinifyImage</a></h2>
</div>
<p>MinifyImage() is a convenience method that scales an image proportionally to half its size.</p>
<p>The format of the MinifyImage method is:</p>
<pre class="code">
Image *MinifyImage(const Image *image,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="ResizeImage">ResizeImage</a></h2>
</div>
<p>ResizeImage() scales an image to the desired dimensions with one of these filters:</p>
<pre class="text">
Bessel Blackman Box
Catrom CubicGaussian
Hanning Hermite Lanczos
Mitchell PointQuandratic
Sinc Triangle
</pre>
<p>Most of the filters are FIR (finite impulse response), however, Bessel, Gaussian, and Sinc are IIR (infinite impulse response). Bessel and Sinc are windowed (brought down to zero) with the Blackman filter.</p>
<p>ResizeImage() was inspired by Paul Heckbert's zoom program.</p>
<p>The format of the ResizeImage method is:</p>
<pre class="code">
Image *ResizeImage(Image *image,const unsigned long columns,
const unsigned long rows,const FilterTypes filter,const double blur,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>columns</h4>
<p>The number of columns in the scaled image.</p>
<h4>rows</h4>
<p>The number of rows in the scaled image.</p>
<h4>filter</h4>
<p>Image filter to use.</p>
<h4>blur</h4>
<p>The blur factor where > 1 is blurry, < 1 is sharp.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="SampleImage">SampleImage</a></h2>
</div>
<p>SampleImage() scales an image to the desired dimensions with pixel sampling. Unlike other scaling methods, this method does not introduce any additional color into the scaled image.</p>
<p>The format of the SampleImage method is:</p>
<pre class="code">
Image *SampleImage(const Image *image,const unsigned long columns,
const unsigned long rows,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>columns</h4>
<p>The number of columns in the sampled image.</p>
<h4>rows</h4>
<p>The number of rows in the sampled image.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="ScaleImage">ScaleImage</a></h2>
</div>
<p>ScaleImage() changes the size of an image to the given dimensions.</p>
<p>The format of the ScaleImage method is:</p>
<pre class="code">
Image *ScaleImage(const Image *image,const unsigned long columns,
const unsigned long rows,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>columns</h4>
<p>The number of columns in the scaled image.</p>
<h4>rows</h4>
<p>The number of rows in the scaled image.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
<div style="margin: auto;">
<h2><a name="ThumbnailImage">ThumbnailImage</a></h2>
</div>
<p>ThumbnailImage() changes the size of an image to the given dimensions and removes any associated profiles. The goal is to produce small low cost thumbnail images suited for display on the Web.</p>
<p>The format of the ThumbnailImage method is:</p>
<pre class="code">
Image *ThumbnailImage(const Image *image,const unsigned long columns,
const unsigned long rows,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p>
<h4>image</h4>
<p>The image.</p>
<h4>columns</h4>
<p>The number of columns in the scaled image.</p>
<h4>rows</h4>
<p>The number of rows in the scaled image.</p>
<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>
</td>
<td id="margin" width="1%" height="100%" valign="top" align="right"> </td>
</tr>
</tbody>
</table>
<div id="linkbar">
<a href="http://redux.imagemagick.org/discussion-server" target="1183986731">Discourse Server</a> |
<a href="../../www/mailing-list.html">Mailing Lists</a> |
<a href="http://redux.imagemagick.org/gallery" target="1368193417">Image Gallery</a> |
<a href="http://redux.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi" target="337688217">ImageMagick Studio</a>
</div>
<div>
<span id="footer-west">© 1999-2005 ImageMagick Studio LLC</span>
</div>
<div style="clear: both; margin: 0; width: 100%; "></div>
</body>
</html>
|
