1 2 3 4 5<!DOCTYPE html> 6<html lang="en"> 7<head> 8 <meta charset="utf-8" /> 9 <meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1,shrink-to-fit=no" /> 10 <title>Image Gradients @ ImageMagick</title> 11 <meta name="application-name" content="ImageMagick" /> 12 <meta name="description" content="Use ImageMagick® to create, edit, compose, or convert bitmap images. You can resize your image, crop it, change its shades and colors, add captions, among other operations." /> 13 <meta name="application-url" content="https://imagemagick.org" /> 14 <meta name="generator" content="PHP" /> 15 <meta name="keywords" content="image, gradients, ImageMagick, PerlMagick, image processing, image, photo, software, Magick++, OpenMP, convert" /> 16 <meta name="rating" content="GENERAL" /> 17 <meta name="robots" content="INDEX, FOLLOW" /> 18 <meta name="generator" content="ImageMagick Studio LLC" /> 19 <meta name="author" content="ImageMagick Studio LLC" /> 20 <meta name="revisit-after" content="2 DAYS" /> 21 <meta name="resource-type" content="document" /> 22 <meta name="copyright" content="Copyright (c) 1999-2019 ImageMagick Studio LLC" /> 23 <meta name="distribution" content="Global" /> 24 <meta name="magick-serial" content="P131-S030410-R485315270133-P82224-A6668-G1245-1" /> 25 <meta name="google-site-verification" content="_bMOCDpkx9ZAzBwb2kF3PRHbfUUdFj2uO8Jd1AXArz4" /> 26 <link href="../www/gradient.html" rel="canonical" /> 27 <link href="../images/wand.png" rel="icon" /> 28 <link href="../images/wand.ico" rel="shortcut icon" /> 29 <link href="assets/magick.css" rel="stylesheet" /> 30</head> 31<body> 32 <header> 33 <nav class="navbar navbar-expand-md navbar-dark fixed-top bg-dark"> 34 <a class="navbar-brand" href="../index.html"><img class="d-block" id="icon" alt="ImageMagick" width="32" height="32" src="../images/wand.ico"/></a> 35 <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsMagick" aria-controls="navbarsMagick" aria-expanded="false" aria-label="Toggle navigation"> 36 <span class="navbar-toggler-icon"></span> 37 </button> 38 39 <div class="navbar-collapse collapse" id="navbarsMagick" style=""> 40 <ul class="navbar-nav mr-auto"> 41 <li class="nav-item "> 42 <a class="nav-link" href="../index.html">Home <span class="sr-only">(current)</span></a> 43 </li> 44 <li class="nav-item "> 45 <a class="nav-link" href="download.html">Download</a> 46 </li> 47 <li class="nav-item "> 48 <a class="nav-link" href="command-line-tools.html">Tools</a> 49 </li> 50 <li class="nav-item "> 51 <a class="nav-link" href="command-line-processing.html">Command-line</a> 52 </li> 53 <li class="nav-item "> 54 <a class="nav-link" href="resources.html">Resources</a> 55 </li> 56 <li class="nav-item "> 57 <a class="nav-link" href="develop.html">Develop</a> 58 </li> 59 <li class="nav-item"> 60 <a class="nav-link" target="_blank" href="https://imagemagick.org/discourse-server/">Community</a> 61 </li> 62 </ul> 63 <form class="form-inline my-2 my-lg-0" action="https://imagemagick.org/script/search.php"> 64 <input class="form-control mr-sm-2" type="text" name="q" placeholder="Search" aria-label="Search"> 65 <button class="btn btn-outline-success my-2 my-sm-0" type="submit" name="sa">Search</button> 66 </form> 67 </div> 68 </nav> 69 <div class="container"> 70 <script async="async" src="http://localhost/pagead/js/adsbygoogle.js"></script> <ins class="adsbygoogle" 71 style="display:block" 72 data-ad-client="ca-pub-3129977114552745" 73 data-ad-slot="6345125851" 74 data-ad-format="auto"></ins> 75 <script> 76 (adsbygoogle = window.adsbygoogle || []).push({}); 77 </script> 78 79 </div> 80 </header> 81 <main class="container"> 82 <div class="magick-template"> 83<div class="magick-header"> 84 85<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> 86 87<p>For a linear gradient, the operator is either:</p> 88 89<pre class="highlight"><code>gradient: 90gradient:color1-color2 91</code></pre> 92 93<p> The for a radial gradient, the operator is either:</p> 94 95<pre class="highlight"><code>radial-gradient: 96radial-gradient:color1-color2 97</code></pre> 98 99<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> 100 101<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> 102 103<p>Gradient colors may be any valid color defined per <a href="color.html" target="_blank">../www/color.html</a>. The named colors of black/white/grayXX and gray(XX[%]) are non-linear gray. For Unix systems, enclose rgb(a) and hex colors in quotes. Use double quotes, if using variables for the values.</p> 104 105<p>Here is an example linear (as opposed to radial) gradient:</p> 106 107<pre class="highlight"><code>magick -size 256x256 gradient: linear_gradient.png 108magick -size 256x256 gradient:white-black linear_gradient.png 109</code></pre> 110<p><img src="../images/gradients/linear_gradient.png" width="256" height="256" /></p> 111 112<p>If you want a radial gradient, try:</p> 113 114<pre class="highlight"><code>magick -size 256x256 radial-gradient: radial_gradient.png 115magick -size 256x256 radial-gradient:white-black radial_gradient.png 116</code></pre> 117<p><img src="../images/gradients/radial_gradient.png" width="256" height="256" /></p> 118 119<p>If you want non-linear grayscale gradients, then add -colorspace RGB -colorspace gray 120before saving the output. For example:<p> 121 122<pre class="highlight"><code>magick -size 256x256 gradient: linear_gradient.png 123magick -size 256x256 gradient:white-black -colorspace RGB -colorspace gray linear_linear_gradient.png 124</code></pre> 125 126<pre class="highlight"><code>magick -size 256x256 radial-gradient: radial_gradient.png 127magick -size 256x256 radial-gradient:white-black -colorspace RGB -colorspace gray linea_radial_gradient.png 128</code></pre> 129 130<p>As of IM 6.9.2.5, gradients have been enhanced through the use of several -defines.</p> 131 132<table class="table table-sm table-striped"> 133 <tr> 134 <td><code>-define gradient:vector=<var>x1</var>,<var>y1</var>, <var>x2</var>,<var>y2</var></code></td> 135 <td>Specifies the direction of the linear gradient going from vector1 136 (x1,y1) to vector2 (x2,y2). Color1 (fromColor) will be located at vector 137 position x1,y1 and color2 (toColor) will be located at vector position 138 x2,y2.</td> 139 </tr> 140 141 <tr> 142 <td><code>-define gradient:center=<var>x</var>,<var>y</var></code></td> 143 <td>Specifies the coordinates of the center point for the radial gradient. 144 The default is the center of the image.</td> 145 </tr> 146 147 <tr> 148 <td><code>-define gradient:radii=<var>x</var>,<var>y</var></code></td> 149 <td>Specifies the x and y radii of the gradient. If the x radius and the y 150 radius are equal, the shape of the radial gradient will be a circle. If 151 they differ, then the shape will be an ellipse. The default values are the 152 maximum of the half width and half height of the image.</td> 153 </tr> 154 155 <tr> 156 <td><code>-define gradient:angle=<var>angle in degrees</var></code></td> 157 <td>For a linear gradient, this specifies the direction of the gradient 158 going from color1 to color2 in a clockwise positive manner relative to 159 north (up). For a radial gradient, this specifies the rotation of the 160 gradient in a clockwise positive manner from its normal X-Y 161 orientation.</td> 162 </tr> 163 164 <tr> 165 <td><code>-define gradient:bounding-box=<var>width</var>x<var>height</var>+<var>x</var>+<var>y</var></code></td> 166 <td>Limits the gradient to a larger or smaller region than the image 167 dimensions. If the region defined by the bounding box is smaller than the 168 image, then color1 will be the color of the background.</td> 169 </tr> 170</table> 171 172 173<p>We also support two convenience defines for setting the linear gradient direction and the radial gradient shape.</p> 174 175<table class="table table-sm table-striped"> 176 <tr> 177 <td><code>-define gradient:direction=<em>{NorthWest, North, Northeast, West, East, SouthWest, South, SouthEast}</em></code></td> 178 <td>Specifies the direction of the linear gradient towards the 179 top/bottom/left/right or diagonal corners.</td> 180 </tr> 181 182 <tr> 183 <td><code>-define gradient:extent=<em>{Circle, Diagonal, Ellipse, Maximum, Minimum}</em></code></td> 184 <td>Specifies the shape of an image centered radial gradient. Circle and 185 Maximum draw a circular radial gradient even for rectangular shaped images 186 of radius equal to the larger of the half-width and half-height of the 187 image. The Circle and Maximum options are both equivalent to the default 188 radial gradient. The Minimum option draws a circular radial gradient 189 even for rectangular shaped images of radius equal to the smaller of the 190 half-width and half-height of the image. The Diagonal option draws a 191 circular radial gradient even for rectangular shaped images of radius equal 192 to the half-diagonal of the image. The Ellipse options draws an elliptical 193 radial gradient for rectangular shaped images of radii equal to half the 194 width and half the height of the image.</td> 195 </tr> 196</table> 197 198<p>Examples</p> 199 200<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> 201 202<pre class="highlight"><code>magick -size 256x128 -define gradient:direction=north gradient:black-white linear_gradient_default.png 203magick -size 256x128 -define gradient:angle=0 gradient:black-white linear_gradient_default.png 204</code></pre> 205<p><img src="../images/gradients/linear_gradient_default.png" width="256" height="128" /></p> 206 207<p>The equivalent of </p> 208 209<pre class="highlight"><code>magick -size 128x256 gradient: -rotate 90 linear_gradient_east.png 210</code></pre> 211 212<p>can be generate by either of the following (or by reversing the direction and swapping color1 and color2):</p> 213 214<pre class="highlight"><code>magick -size 256x128 -define gradient:direction=east gradient:black-white linear_gradient_east.png 215magick -size 256x128 -define gradient:angle=90 gradient:black-white linear_gradient_east.png 216</code></pre> 217<p><img src="../images/gradients/linear_gradient_east.png" width="256" height="128" /></p> 218 219 220<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> 221 222 223<pre class="highlight"><code>magick -size 256x128 radial-gradient:black-white radial_gradient_maximum.png 224magick -size 256x128 -define gradient:radii=128,128 radial-gradient:black-white radial_gradient_maximum.png 225</code></pre> 226<p><img src="../images/gradients/radial_gradient_maximum.png" width="256" height="128" /></p> 227 228<pre class="highlight"><code>magick -size 256x128 -define gradient:extent=minimum radial-gradient:black-white radial_gradient_minimum.png 229magick -size 256x128 -define gradient:radii=64,64 radial-gradient:black-white radial_gradient_minimum.png 230</code></pre> 231<p><img src="../images/gradients/radial_gradient_minimum.png" width="256" height="128" /></p> 232 233<pre class="highlight"><code>magick -size 256x128 -define gradient:extent=diagonal radial-gradient:black-white radial_gradient_diagonal.png 234</code></pre> 235<p><img src="../images/gradients/radial_gradient_diagonal.png" width="256" height="128" /></p> 236 237<pre class="highlight"><code>magick -size 256x128 -define gradient:extent=ellipse radial-gradient:black-white radial_gradient_ellipse.png 238magick -size 256x128 -define gradient:radii=128,64 radial-gradient:black-white radial_gradient_ellipse.png 239</code></pre> 240<p><img src="../images/gradients/radial_gradient_ellipse.png" width="256" height="128" /></p> 241 242<pre class="highlight"><code>conmagickvert -size 256x256 -define gradient:radii=128,64 -define gradient:angle=45 radial-gradient:black-white radial_gradient_ellipse_angle45.png 243</code></pre> 244<p><img src="../images/gradients/radial_gradient_ellipse_angle45.png" width="256" height="256" /></p> 245 246</div> 247 248 </div> 249 </main><!-- /.container --> 250 <footer class="magick-footer"> 251 <p><a href="security-policy.html">Security</a> • 252 <a href="architecture.html">Architecture</a> • 253 <a href="links.html">Related</a> • 254 <a href="sitemap.html">Sitemap</a> 255 256 <a href="gradient.html#"><img class="d-inline" id="wand" alt="And Now a Touch of Magick" width="16" height="16" src="../images/wand.ico"/></a> 257 258 <a href="http://pgp.mit.edu/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> • 259 <a href="support.html">Donate</a> • 260 <a href="https://imagemagick.org/script/contact.php">Contact Us</a> 261 <br/> 262 <small>© 1999-2019 ImageMagick Studio LLC</small></p> 263 </footer> 264 265 <!-- Javascript assets --> 266 <script src="assets/magick.js" crossorigin="anonymous"></script> 267 <script>window.jQuery || document.write('<script src="https://localhost/ajax/libs/jquery/3.3.1/jquery.min.js"><\/script>')</script> 268</body> 269</html> 270<!-- Magick Cache 5th January 2019 11:42 -->
