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Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]9 <title>ImageMagick: Image Gradients</title>
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Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]56<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]57
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]58<p>For a linear gradient, the operator is either:</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]59
60<pre>
61gradient:
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]62gradient:color1-color2
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]63</pre>
64
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]65<p> The for a radial gradient, the operator is either:</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]66
67<pre>
68radial-gradient:
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]69radial-gradient:color1-color2
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]70</pre>
71
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]72<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]73
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]74<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]75
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]76<p>Gradient colors may be any valid color defined per <a href="http://www.imagemagick.org/www/color.html" target="_blank">http://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]77
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]78<p>Here is an example linear gradient:</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]79
80<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]81convert -size 256x256 gradient: linear_gradient.png
82convert -size 256x256 gradient:white-black linear_gradient.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]83</pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]84<p><img src="http://nextgen.imagemagick.org/images/gradients/linear_gradient.png" width="256" height="256"></p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]85
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]86<p>If you want a radial gradient, try:</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]87
88<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]89convert -size 256x256 radial-gradient: radial_gradient.png
90convert -size 256x256 radial-gradient:white-black radial_gradient.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]91</pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]92<p><img src="http://nextgen.imagemagick.org/images/gradients/radial_gradient.png" width="256" height="256"></p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]93
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]94<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]95
96<table class="table table-condensed table-striped">
97 <tr>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]98 <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]99 <td>Specifies the direction of the linear gradient going from vector1
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]100 (x1,y1) to vector2 (x2,y2). Color1 (fromColor) will be located at vector
101 position x1,y1 and color2 (toColor) will be located at vector position
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]102 x2,y2.</td>
103 </tr>
104
105 <tr>
106 <td><code>-define gradient:center=<var>x</var>,<var>y</var></code></td>
107 <td>Specifies the coordinates of the center point for the radial gradient.
108 The default is the center of the image.</td>
109 </tr>
110
111 <tr>
112 <td><code>-define gradient:radii=<var>x</var>,<var>y</var></code></td>
113 <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^]114 radius are equal, the shape of the radial gradient will be a circle. If
115 they differ, then the shape will be an ellipse. The default values are the
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]116 maximum of the half width and half height of the image.</td>
117 </tr>
118
119 <tr>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]120 <td><code>-define gradient:angle=<var>angle in degrees</var></code></td>
121 <td>For a linear gradient, this specifies the direction of the gradient
122 going from color1 to color2 in a clockwise positive manner relative to
123 north (up). For a radial gradient, this specifies the rotation of the
124 gradient in a clockwise positive manner from its normal X-Y
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]125 orientation.</td>
126 </tr>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]127
128 <tr>
129 <td><code>-define gradient:bounding-box=<var>width</var>x<var>height</var>+<var>x</var>+<var>y</var></code></td>
130 <td>Limits the gradient to a larger or smaller region than the image
131 dimensions. If the region defined by the bounding box is smaller than the
132 image, then color1 will be the color of the background.</td>
133 </tr>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]134</table>
135
136
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]137<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]138
139<table class="table table-condensed table-striped">
140 <tr>
141 <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^]142 <td>Specifies the direction of the linear gradient towards the
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]143 top/bottom/left/right or diagonal corners.</td>
144 </tr>
145
146 <tr>
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]147 <td><code>-define gradient:extent=<em>{Circle, Diagonal, Ellipse, Maximum, Minimum}</code></td>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]148 <td>Specifies the shape of an image centered radial gradient. Circle and
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]149 Maximum draw a circular radial gradient even for rectangular shaped images
150 of radius equal to the larger of the half-width and half-height of the
151 image. The Circle and Maximum options are both equivalent to the default
152 radial gradient. The Minimum option draws a circular radial gradient
153 even for rectangular shaped images of radius equal to the smaller of the
154 half-width and half-height of the image. The Diagonal option draws a
155 circular radial gradient even for rectangular shaped images of radius equal
156 to the half-diagonal of the image. The Ellipse options draws an elliptical
157 radial gradient for rectangular shaped images of radii equal to half the
158 width and half the height of the image.</td>
159 </tr>
160</table>
161
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]162<p>Examples</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]163
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]164<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]165
166<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]167convert -size 256x128 -define gradient:direction=north gradient:black-white linear_gradient_default.png
168convert -size 256x128 -define gradient:angle=0 gradient:black-white linear_gradient_default.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]169</pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]170<p><img src="http://nextgen.imagemagick.org/images/gradients/linear_gradient_default.png" width="256" height="128"></p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]171
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]172<p>The equivalent of </p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]173
174<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]175convert -size 128x256 gradient: -rotate 90 linear_gradient_east.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]176</pre>
177
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]178<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]179
180<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]181convert -size 256x128 -define gradient:direction=east gradient:black-white linear_gradient_east.png
182convert -size 256x128 -define gradient:angle=90 gradient:black-white linear_gradient_east.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]183</pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]184<p><img src="http://nextgen.imagemagick.org/images/gradients/linear_gradient_east.png" width="256" height="128"></p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]185
186
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]187<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]188
189
190<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]191convert -size 256x128 radial-gradient:black-white radial_gradient_maximum.png
192convert -size 256x128 -define gradient:radii=128,128 radial-gradient:black-white radial_gradient_maximum.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]193</pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame^]194<p><img src="http://nextgen.imagemagick.org/images/gradients/radial_gradient_maximum.png" width="256" height="128"></p>
195
196<pre>
197convert -size 256x128 -define gradient:extent=minimum radial-gradient:black-white radial_gradient_minimum.png
198convert -size 256x128 -define gradient:radii=64,64 radial-gradient:black-white radial_gradient_minimum.png
199</pre>
200<p><img src="http://nextgen.imagemagick.org/images/gradients/radial_gradient_minimum.png" width="256" height="128"></p>
201
202<pre>
203convert -size 256x128 -define gradient:extent=diagonal radial-gradient:black-white radial_gradient_diagonal.png
204</pre>
205<p><img src="http://nextgen.imagemagick.org/images/gradients/radial_gradient_diagonal.png" width="256" height="128"></p>
206
207<pre>
208convert -size 256x128 -define gradient:extent=ellipse radial-gradient:black-white radial_gradient_ellipse.png
209convert -size 256x128 -define gradient:radii=128,64 radial-gradient:black-white radial_gradient_ellipse.png
210</pre>
211<p><img src="http://nextgen.imagemagick.org/images/gradients/radial_gradient_ellipse.png" width="256" height="128"></p>
212
213<pre>
214convert -size 256x256 -define gradient:radii=128,64 -define gradient:angle=45 radial-gradient:black-white radial_gradient_ellipse_angle45.png
215</pre>
216<p><img src="http://nextgen.imagemagick.org/images/gradients/radial_gradient_ellipse_angle45.png" width="256" height="256"></p>
217
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