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Cristy6549abb2016-11-10 08:25:55 -0500[diff] [blame^]11 <title>Image Gradients @ ImageMagick</title>
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Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]61<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]62
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]63<p>For a linear gradient, the operator is either:</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]64
65<pre>
66gradient:
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]67gradient:color1-color2
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]68</pre>
69
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]70<p> The for a radial gradient, the operator is either:</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]71
72<pre>
73radial-gradient:
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]74radial-gradient:color1-color2
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]75</pre>
76
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]77<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]78
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]79<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]80
Cristy6549abb2016-11-10 08:25:55 -0500[diff] [blame^]81<p>Gradient colors may be any valid color defined per <a href="https://www.imagemagick.org/script/color.html" target="_blank">https://www.imagemagick.org/script/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]82
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]83<p>Here is an example linear gradient:</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]84
85<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]86convert -size 256x256 gradient: linear_gradient.png
87convert -size 256x256 gradient:white-black linear_gradient.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]88</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]89<p><img src="../images/gradients/linear_gradient.png" width="256" height="256"></p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]90
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]91<p>If you want a radial gradient, try:</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]92
93<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]94convert -size 256x256 radial-gradient: radial_gradient.png
95convert -size 256x256 radial-gradient:white-black radial_gradient.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]96</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]97<p><img src="../images/gradients/radial_gradient.png" width="256" height="256"></p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]98
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]99<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]100
101<table class="table table-condensed table-striped">
102 <tr>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]103 <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]104 <td>Specifies the direction of the linear gradient going from vector1
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]105 (x1,y1) to vector2 (x2,y2). Color1 (fromColor) will be located at vector
106 position x1,y1 and color2 (toColor) will be located at vector position
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]107 x2,y2.</td>
108 </tr>
109
110 <tr>
111 <td><code>-define gradient:center=<var>x</var>,<var>y</var></code></td>
112 <td>Specifies the coordinates of the center point for the radial gradient.
113 The default is the center of the image.</td>
114 </tr>
115
116 <tr>
117 <td><code>-define gradient:radii=<var>x</var>,<var>y</var></code></td>
118 <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]119 radius are equal, the shape of the radial gradient will be a circle. If
120 they differ, then the shape will be an ellipse. The default values are the
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]121 maximum of the half width and half height of the image.</td>
122 </tr>
123
124 <tr>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]125 <td><code>-define gradient:angle=<var>angle in degrees</var></code></td>
126 <td>For a linear gradient, this specifies the direction of the gradient
127 going from color1 to color2 in a clockwise positive manner relative to
128 north (up). For a radial gradient, this specifies the rotation of the
129 gradient in a clockwise positive manner from its normal X-Y
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]130 orientation.</td>
131 </tr>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]132
133 <tr>
134 <td><code>-define gradient:bounding-box=<var>width</var>x<var>height</var>+<var>x</var>+<var>y</var></code></td>
135 <td>Limits the gradient to a larger or smaller region than the image
136 dimensions. If the region defined by the bounding box is smaller than the
137 image, then color1 will be the color of the background.</td>
138 </tr>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]139</table>
140
141
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]142<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]143
144<table class="table table-condensed table-striped">
145 <tr>
146 <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]147 <td>Specifies the direction of the linear gradient towards the
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]148 top/bottom/left/right or diagonal corners.</td>
149 </tr>
150
151 <tr>
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]152 <td><code>-define gradient:extent=<em>{Circle, Diagonal, Ellipse, Maximum, Minimum}</code></td>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]153 <td>Specifies the shape of an image centered radial gradient. Circle and
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]154 Maximum draw a circular radial gradient even for rectangular shaped images
155 of radius equal to the larger of the half-width and half-height of the
156 image. The Circle and Maximum options are both equivalent to the default
157 radial gradient. The Minimum option draws a circular radial gradient
158 even for rectangular shaped images of radius equal to the smaller of the
159 half-width and half-height of the image. The Diagonal option draws a
160 circular radial gradient even for rectangular shaped images of radius equal
161 to the half-diagonal of the image. The Ellipse options draws an elliptical
162 radial gradient for rectangular shaped images of radii equal to half the
163 width and half the height of the image.</td>
164 </tr>
165</table>
166
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]167<p>Examples</p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]168
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]169<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]170
171<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]172convert -size 256x128 -define gradient:direction=north gradient:black-white linear_gradient_default.png
173convert -size 256x128 -define gradient:angle=0 gradient:black-white linear_gradient_default.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]174</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]175<p><img src="../images/gradients/linear_gradient_default.png" width="256" height="128"></p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]176
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]177<p>The equivalent of </p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]178
179<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]180convert -size 128x256 gradient: -rotate 90 linear_gradient_east.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]181</pre>
182
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]183<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]184
185<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]186convert -size 256x128 -define gradient:direction=east gradient:black-white linear_gradient_east.png
187convert -size 256x128 -define gradient:angle=90 gradient:black-white linear_gradient_east.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]188</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]189<p><img src="../images/gradients/linear_gradient_east.png" width="256" height="128"></p>
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]190
191
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]192<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]193
194
195<pre>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]196convert -size 256x128 radial-gradient:black-white radial_gradient_maximum.png
197convert -size 256x128 -define gradient:radii=128,128 radial-gradient:black-white radial_gradient_maximum.png
Cristy882d9f42015-10-29 16:48:39 -0400[diff] [blame]198</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]199<p><img src="../images/gradients/radial_gradient_maximum.png" width="256" height="128"></p>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]200
201<pre>
202convert -size 256x128 -define gradient:extent=minimum radial-gradient:black-white radial_gradient_minimum.png
203convert -size 256x128 -define gradient:radii=64,64 radial-gradient:black-white radial_gradient_minimum.png
204</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]205<p><img src="../images/gradients/radial_gradient_minimum.png" width="256" height="128"></p>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]206
207<pre>
208convert -size 256x128 -define gradient:extent=diagonal radial-gradient:black-white radial_gradient_diagonal.png
209</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]210<p><img src="../images/gradients/radial_gradient_diagonal.png" width="256" height="128"></p>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]211
212<pre>
213convert -size 256x128 -define gradient:extent=ellipse radial-gradient:black-white radial_gradient_ellipse.png
214convert -size 256x128 -define gradient:radii=128,64 radial-gradient:black-white radial_gradient_ellipse.png
215</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]216<p><img src="../images/gradients/radial_gradient_ellipse.png" width="256" height="128"></p>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]217
218<pre>
219convert -size 256x256 -define gradient:radii=128,64 -define gradient:angle=45 radial-gradient:black-white radial_gradient_ellipse_angle45.png
220</pre>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]221<p><img src="../images/gradients/radial_gradient_ellipse_angle45.png" width="256" height="256"></p>
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