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Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]8 <title>ImageMagick: Image Gradients</title>
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Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]60<p class="lead magick-description">An image gradient creates a gradual blend between two colors formed into a shape that is linear, circular, or ellipical.</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]61
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]62<p>For a linear gradient, the operator is either:</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]63
64<pre>
65gradient:
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]66gradient:color1-color2
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]67</pre>
68
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]69<p> The for a radial gradient, the operator is either:</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]70
71<pre>
72radial-gradient:
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]73radial-gradient:color1-color2
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]74</pre>
75
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]76<p> In the above, color1 is the fromColor and color2 is the toColor, as described in more detail below. The default is white for color1 and black for color2, i.e., white-black.</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]77
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]78<p>The default for a linear gradient has color1 at the top of the image and color2 at the bottom of the image. Similarly, the default for a radial gradient has color1 at the center of the image and color2 at the boundary of the image.</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]79
Cristy364a72f2016-11-04 22:38:41 -0400[diff] [blame^]80<p>Gradient colors may be any valid color defined per <a href="color.html" target="_blank">https://www.imagemagick.org/www/color.html</a>. The named colors of black/white/grayXX are non-linear gray gradients; whereas gray(XX[%]) is a linear gray gradient. For Unix systems, enclose rgb(a) and hex colors in quotes. Use double quotes, if using variables for the values.</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]81
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]82<p>Here is an example linear gradient:</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]83
84<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]85convert -size 256x256 gradient: linear_gradient.png
86convert -size 256x256 gradient:white-black linear_gradient.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]87</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]88<p><img src="../images/gradients/linear_gradient.png" width="256" height="256"></p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]89
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]90<p>If you want a radial gradient, try:</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]91
92<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]93convert -size 256x256 radial-gradient: radial_gradient.png
94convert -size 256x256 radial-gradient:white-black radial_gradient.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]95</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]96<p><img src="../images/gradients/radial_gradient.png" width="256" height="256"></p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]97
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]98<p>As of IM 6.9.2.5, gradients have been enhanced through the use of several -defines.</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]99
100<table class="table table-condensed table-striped">
101 <tr>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]102 <td><code>-define gradient:vector=<var>x1</var>,<var>y1</var>, <var>x2</var>,<var>y2</var></code> <code></td>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]103 <td>Specifies the direction of the linear gradient going from vector1
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]104 (x1,y1) to vector2 (x2,y2). Color1 (fromColor) will be located at vector
105 position x1,y1 and color2 (toColor) will be located at vector position
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]106 x2,y2.</td>
107 </tr>
108
109 <tr>
110 <td><code>-define gradient:center=<var>x</var>,<var>y</var></code></td>
111 <td>Specifies the coordinates of the center point for the radial gradient.
112 The default is the center of the image.</td>
113 </tr>
114
115 <tr>
116 <td><code>-define gradient:radii=<var>x</var>,<var>y</var></code></td>
117 <td>Specifies the x and y radii of the gradient. If the x radius and the y
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]118 radius are equal, the shape of the radial gradient will be a circle. If
119 they differ, then the shape will be an ellipse. The default values are the
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]120 maximum of the half width and half height of the image.</td>
121 </tr>
122
123 <tr>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]124 <td><code>-define gradient:angle=<var>angle in degrees</var></code></td>
125 <td>For a linear gradient, this specifies the direction of the gradient
126 going from color1 to color2 in a clockwise positive manner relative to
127 north (up). For a radial gradient, this specifies the rotation of the
128 gradient in a clockwise positive manner from its normal X-Y
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]129 orientation.</td>
130 </tr>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]131
132 <tr>
133 <td><code>-define gradient:bounding-box=<var>width</var>x<var>height</var>+<var>x</var>+<var>y</var></code></td>
134 <td>Limits the gradient to a larger or smaller region than the image
135 dimensions. If the region defined by the bounding box is smaller than the
136 image, then color1 will be the color of the background.</td>
137 </tr>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]138</table>
139
140
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]141<p>We also support two convenience defines for setting the linear gradient direction and the radial gradient shape.</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]142
143<table class="table table-condensed table-striped">
144 <tr>
145 <td><code>-define gradient:direction=<em>{NorthWest, North, Northeast, West, East, SouthWest, South, SouthEast}</em></code></td>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]146 <td>Specifies the direction of the linear gradient towards the
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]147 top/bottom/left/right or diagonal corners.</td>
148 </tr>
149
150 <tr>
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]151 <td><code>-define gradient:extent=<em>{Circle, Diagonal, Ellipse, Maximum, Minimum}</code></td>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]152 <td>Specifies the shape of an image centered radial gradient. Circle and
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]153 Maximum draw a circular radial gradient even for rectangular shaped images
154 of radius equal to the larger of the half-width and half-height of the
155 image. The Circle and Maximum options are both equivalent to the default
156 radial gradient. The Minimum option draws a circular radial gradient
157 even for rectangular shaped images of radius equal to the smaller of the
158 half-width and half-height of the image. The Diagonal option draws a
159 circular radial gradient even for rectangular shaped images of radius equal
160 to the half-diagonal of the image. The Ellipse options draws an elliptical
161 radial gradient for rectangular shaped images of radii equal to half the
162 width and half the height of the image.</td>
163 </tr>
164</table>
165
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]166<p>Examples</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]167
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]168<p>The default linear gradient may also be generated in any of the following ways (or by reversing the direction and swapping color1 and color2):</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]169
170<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]171convert -size 256x128 -define gradient:direction=north gradient:black-white linear_gradient_default.png
172convert -size 256x128 -define gradient:angle=0 gradient:black-white linear_gradient_default.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]173</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]174<p><img src="../images/gradients/linear_gradient_default.png" width="256" height="128"></p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]175
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]176<p>The equivalent of </p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]177
178<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]179convert -size 128x256 gradient: -rotate 90 linear_gradient_east.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]180</pre>
181
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]182<p>can be generate by either of the following (or by reversing the direction and swapping color1 and color2):</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]183
184<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]185convert -size 256x128 -define gradient:direction=east gradient:black-white linear_gradient_east.png
186convert -size 256x128 -define gradient:angle=90 gradient:black-white linear_gradient_east.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]187</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]188<p><img src="../images/gradients/linear_gradient_east.png" width="256" height="128"></p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]189
190
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]191<p>Examples of radial gradients going from black in the center to white at the boundary for the cases of "maximum/circle/default", "minimum", "diagonal", "ellipse" and 45 degree rotated ellipse, respectively, follow below.</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]192
193
194<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]195convert -size 256x128 radial-gradient:black-white radial_gradient_maximum.png
196convert -size 256x128 -define gradient:radii=128,128 radial-gradient:black-white radial_gradient_maximum.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]197</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]198<p><img src="../images/gradients/radial_gradient_maximum.png" width="256" height="128"></p>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]199
200<pre>
201convert -size 256x128 -define gradient:extent=minimum radial-gradient:black-white radial_gradient_minimum.png
202convert -size 256x128 -define gradient:radii=64,64 radial-gradient:black-white radial_gradient_minimum.png
203</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]204<p><img src="../images/gradients/radial_gradient_minimum.png" width="256" height="128"></p>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]205
206<pre>
207convert -size 256x128 -define gradient:extent=diagonal radial-gradient:black-white radial_gradient_diagonal.png
208</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]209<p><img src="../images/gradients/radial_gradient_diagonal.png" width="256" height="128"></p>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]210
211<pre>
212convert -size 256x128 -define gradient:extent=ellipse radial-gradient:black-white radial_gradient_ellipse.png
213convert -size 256x128 -define gradient:radii=128,64 radial-gradient:black-white radial_gradient_ellipse.png
214</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]215<p><img src="../images/gradients/radial_gradient_ellipse.png" width="256" height="128"></p>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]216
217<pre>
218convert -size 256x256 -define gradient:radii=128,64 -define gradient:angle=45 radial-gradient:black-white radial_gradient_ellipse_angle45.png
219</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]220<p><img src="../images/gradients/radial_gradient_ellipse_angle45.png" width="256" height="256"></p>
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