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
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>enhance - Enhance an Image</title>
<link rel="stylesheet" type="text/css" href="../magick.css">
</head>
<body marginheight="1" marginwidth="1" topmargin="1" leftmargin="1">
<a name="top"></a>
<table border="0" cellpadding="0" cellspacing="0" summary="Masthead" width="100%">
<tbody>
<tr>
<td bgcolor="#003399" width="25%" height="118" background="../../images/background.gif"><a href="http://www.imagemagick.org/"><img src="../../images/script.gif" width="278" height="118" border="0" alt="" /></a></td>
<td bgcolor="#003399" width="60%" height="118" background="../../images/background.gif"><a href="http://www.networkeleven.com/direct.php?magick_all"><img src="../../images/promote.png" border="0" width="186" height="52" vspace="29" alt="Powered by NetworkEleven" /></a></td>
<td bgcolor="#003399" width="114" height="118" align="right"><img src="../../images/sprite.png" width="114" height="118" alt="" /></td>
<td bgcolor="#003399" width="114" height="118" align="right"><a href="http://www.imagemagick.net"><img src="../../images/logo.png" width="114" height="118" border="0" alt="ImageMagick logo" /></a></td>
</tr></tbody></table>
<table align="left" border="0" cellpadding="2" cellspacing="2" summary="Navigation buttons" width="20%">
<tr>
<td>
<form target="_self" action="../../index.html"><input type="submit" title="ImageMagick Home" value=" Home" style="background-color: #1947A3; background-image:url('../../../images/background.gif'); color:#fbc713; font-weight:bold"></form></td>
<td>
<form target="_self" action="../../www/apis.html"><input type="submit" title="ImageMagick API" value=" API " style="background-color: #1947A3; background-image:url('../../../images/background.gif'); color:#fbc713; font-weight:bold"></form></td>
<td>
<form target="_self" action="../../www/archives.html"><input type="submit" title="ImageMagick Download" value="Download" style="background-color: #1947A3; background-image:url('../../../images/background.gif'); color:#fbc713; font-weight:bold"></form></td></tr></table>
<div align="right" style="margin-top:3px; padding-right:4px">
<form action="http://studio.imagemagick.org/Sage/scripts/Sage.cgi"><input type="TEXT" name="query" size="32" maxlength="255"> <input type="SUBMIT" name="sa" value="Search" style="background-color: #1947A3; background-image:url('../../../images/background.gif'); bgcolor:#003399; color:#fbc713; font-weight:bold"></form></div>
<table align="left" border="0" cellpadding="10" cellspacing="0" style="margin-top:-17px" width="100%">
<tr>
<td>
<P><a name="__index__"></a></P>
<!-- INDEX BEGIN -->
<ul>
<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#function_descriptions">FUNCTION DESCRIPTIONS</a></li>
<ul>
<li><a href="#contrastimage">ContrastImage</a></li>
<li><a href="#enhanceimage">EnhanceImage</a></li>
<li><a href="#equalizeimage">EqualizeImage</a></li>
<li><a href="#gammaimagechannel">GammaImageChannel</a></li>
<li><a href="#levelimagechannel">LevelImageChannel</a></li>
<li><a href="#modulateimage">ModulateImage</a></li>
<li><a href="#negateimagechannel">NegateImageChannel</a></li>
<li><a href="#normalizeimagechannel">NormalizeImageChannel</a></li>
</ul>
</ul>
<!-- INDEX END -->
<hr />
<P>
</P>
<h1><a name="name">NAME</a></h1>
<P>enhance - Enhance an Image</P>
<P>
</P>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<P>MagickBooleanType <strong>ContrastImage</strong>( Image *image, const MagickBooleanType sharpen );</P>
<P>Image * <strong>EnhanceImage</strong>( const Image *image, ExceptionInfo *exception );</P>
<P>MagickBooleanType <strong>EqualizeImage</strong>( Image *image );</P>
<P>MagickBooleanType <strong>GammaImageChannel</strong>( Image *image, const ChannelType channel, const double gamma );</P>
<P>MagickBooleanType <strong>LevelImageChannel</strong>( Image *image, const ChannelType channel, const char *levels );</P>
<P>MagickBooleanType <strong>ModulateImage</strong>( Image *image, const char *modulate );</P>
<P>MagickBooleanType <strong>NegateImageChannel</strong>( Image *image, const ChannelType channel, const MagickBooleanType grayscale );</P>
<P>
</P>
<hr />
<h1><a name="function_descriptions">FUNCTION DESCRIPTIONS</a></h1>
<P>
</P>
<h2><a name="contrastimage">ContrastImage</a></h2>
<blockquote>ContrastImage() enhances the intensity differences between the lighter and darker elements of the image. Set sharpen to a value other than 0 to increase the image contrast otherwise the contrast is reduced. </blockquote><P>The format of the ContrastImage method is:</P>
<blockquote>MagickBooleanType ContrastImage ( <A HREF="types.html#Image">Image</A> *image, const MagickBooleanType sharpen ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong><a name="item_o_image_3a">image:</a></strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong><a name="item_o_sharpen_3a">sharpen:</a></strong><br />
</dt>
<DD>
Increase or decrease image contrast.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="enhanceimage">EnhanceImage</a></h2>
<blockquote>EnhanceImage() applies a digital filter that improves the quality of a noisy image. </blockquote><P>The format of the EnhanceImage method is:</P>
<blockquote><A HREF="types.html#Image">Image</A> *EnhanceImage ( const <A HREF="types.html#Image">Image</A> *image, <A HREF="types.html#ExceptionInfo">ExceptionInfo</A> *exception ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong><a name="item_o_exception_3a">exception:</a></strong><br />
</dt>
<DD>
Return any errors or warnings in this structure.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="equalizeimage">EqualizeImage</a></h2>
<blockquote>EqualizeImage() applies a histogram equalization to the image. </blockquote><P>The format of the EqualizeImage method is:</P>
<blockquote>MagickBooleanType EqualizeImage ( <A HREF="types.html#Image">Image</A> *image ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="gammaimagechannel">GammaImageChannel</a></h2>
<P>Use <code>GammaImage()</code> to gamma-correct a particular image channel. The same image viewed on different devices will have perceptual differences in the way the image's intensities are represented on the screen. Specify individual gamma levels for the red, green, and blue channels, or adjust all three with the gamma parameter. Values typically range from 0.8 to 2.3.</P>
<P>You can also reduce the influence of a particular channel with a gamma value of 0.</P>
<P>The format of the GammaImage method is:</P>
<blockquote>MagickBooleanType GammaImageChannel ( <A HREF="types.html#Image">Image</A> *image, const <A HREF="types.html#ChannelType">ChannelType</A> channel, const double gamma ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong><a name="item_o_channel_3a">channel:</a></strong><br />
</dt>
<DD>
The channel.
</dd>
<P></P>
<dt><strong><a name="item_o_gamma_3a">gamma:</a></strong><br />
</dt>
<DD>
The image gamma.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="levelimagechannel">LevelImageChannel</a></h2>
<P><code>LevelImage()</code> adjusts the levels of a particular image channel by scaling the colors falling between specified white and black points to the full available quantum range. The parameters provided represent the black, mid, and white points. The black point specifies the darkest color in the image. Colors darker than the black point are set to zero. Gamma specifies a gamma correction to apply to the image. White point specifies the lightest color in the image. Colors brighter than the white point are set to the maximum quantum value.</P>
<P>The format of the LevelImage method is:</P>
<blockquote>MagickBooleanType LevelImageChannel ( <A HREF="types.html#Image">Image</A> *image, const <A HREF="types.html#ChannelType">ChannelType</A> channel, const char *levels ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong>channel:</strong><br />
</dt>
<DD>
The channel.
</dd>
<P></P>
<dt><strong><a name="item_o_levels_3a">levels:</a></strong><br />
</dt>
<DD>
Specify the levels where the black and white points have the
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="modulateimage">ModulateImage</a></h2>
<blockquote>ModulateImage() lets you control the brightness, saturation, and hue of an image. Modulate represents the brightness, saturation, and hue as one parameter ( e.g. 90, 150, 100 ) . </blockquote><P>The format of the ModulateImage method is:</P>
<blockquote>MagickBooleanType ModulateImage ( <A HREF="types.html#Image">Image</A> *image, const char *modulate ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong><a name="item_o_modulate_3a">modulate:</a></strong><br />
</dt>
<DD>
Define the percent change in brightness, saturation, and hue.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="negateimagechannel">NegateImageChannel</a></h2>
<blockquote>NegateImageChannel() negates the colors in the reference image. The grayscale option means that only grayscale values within the image are negated. </blockquote><P>The format of the NegateImageChannel method is:</P>
<blockquote>MagickBooleanType NegateImageChannel ( <A HREF="types.html#Image">Image</A> *image, const <A HREF="types.html#ChannelType">ChannelType</A> channel, const MagickBooleanType grayscale ); </blockquote><P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong>channel:</strong><br />
</dt>
<DD>
The channel.
</dd>
<P></P>
<dt><strong><a name="item_o_grayscale_3a">grayscale:</a></strong><br />
</dt>
<DD>
If MagickTrue, only negate grayscale pixels within the image.
</dd>
<P></P></dl>
<P>
</P>
<h2><a name="normalizeimagechannel">NormalizeImageChannel</a></h2>
<blockquote>The NormalizeImageChannel() method enhances the contrast of a color image by adjusting the pixels color to span the entire range of colors available. </blockquote><P>The format of the NormalizeImage method is:</P>
<pre>
MagickBooleanType NormalizeImage(Image *image,
const unsigned long channel)</pre>
<P>A description of each parameter follows:</P>
<dl>
<dt><strong>image:</strong><br />
</dt>
<DD>
The image.
</dd>
<P></P>
<dt><strong>channel:</strong><br />
</dt>
<DD>
The channel.
</dd>
</dl>
<HR>
<a href="#top"><img src="../../../images/top.gif" border=0 width=42 height=42 align="right" alt="Top of page"></a>
<form action="http://studio.imagemagick.org/magick/" style="margin-top:5px">
<input type="submit" title="Help!" value="Help!" style="background-image:url('../../../images/background.gif'); color:#fbc713; font-weight:bold">
<small>"Image manipulation software that works like magick"</small>
</form></td>
</tr></table>
</body>
</html>
|
