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<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>
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<p>For a linear gradient, the operator is either:</p>
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<pre class="highlight"><code>gradient:
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gradient:color1-color2
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</code></pre>
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<p> The for a radial gradient, the operator is either:</p>
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<pre class="highlight"><code>radial-gradient:
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radial-gradient:color1-color2
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</code></pre>
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<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>
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<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>
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<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>
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<p>Here is an example linear (as opposed to radial) gradient:</p>
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<pre class="highlight"><code>magick -size 256x256 gradient: linear_gradient.png
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magick -size 256x256 gradient:white-black linear_gradient.png
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</code></pre>
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<p><img src="../images/gradients/linear_gradient.png" width="256" height="256" /></p>
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<p>If you want a radial gradient, try:</p>
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<pre class="highlight"><code>magick -size 256x256 radial-gradient: radial_gradient.png
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magick -size 256x256 radial-gradient:white-black radial_gradient.png
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</code></pre>
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<p><img src="../images/gradients/radial_gradient.png" width="256" height="256" /></p>
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<p>If you want non-linear grayscale gradients, then add -colorspace RGB -colorspace gray
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before saving the output. For example:<p>
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<pre class="highlight"><code>magick -size 256x256 gradient: linear_gradient.png
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magick -size 256x256 gradient:white-black -colorspace RGB -colorspace gray linear_linear_gradient.png
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</code></pre>
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<pre class="highlight"><code>magick -size 256x256 radial-gradient: radial_gradient.png
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magick -size 256x256 radial-gradient:white-black -colorspace RGB -colorspace gray linea_radial_gradient.png
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</code></pre>
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<p>As of IM 6.9.2.5, gradients have been enhanced through the use of several -defines.</p>
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<table class="table table-sm table-striped">
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<tr>
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<td><code>-define gradient:vector=<var>x1</var>,<var>y1</var>, <var>x2</var>,<var>y2</var></code></td>
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<td>Specifies the direction of the linear gradient going from vector1
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(x1,y1) to vector2 (x2,y2). Color1 (fromColor) will be located at vector
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position x1,y1 and color2 (toColor) will be located at vector position
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x2,y2.</td>
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</tr>
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<tr>
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<td><code>-define gradient:center=<var>x</var>,<var>y</var></code></td>
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<td>Specifies the coordinates of the center point for the radial gradient.
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The default is the center of the image.</td>
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</tr>
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<tr>
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<td><code>-define gradient:radii=<var>x</var>,<var>y</var></code></td>
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<td>Specifies the x and y radii of the gradient. If the x radius and the y
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radius are equal, the shape of the radial gradient will be a circle. If
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they differ, then the shape will be an ellipse. The default values are the
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maximum of the half width and half height of the image.</td>
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</tr>
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<tr>
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<td><code>-define gradient:angle=<var>angle in degrees</var></code></td>
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<td>For a linear gradient, this specifies the direction of the gradient
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going from color1 to color2 in a clockwise positive manner relative to
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north (up). For a radial gradient, this specifies the rotation of the
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gradient in a clockwise positive manner from its normal X-Y
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orientation.</td>
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</tr>
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<tr>
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<td><code>-define gradient:bounding-box=<var>width</var>x<var>height</var>+<var>x</var>+<var>y</var></code></td>
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<td>Limits the gradient to a larger or smaller region than the image
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dimensions. If the region defined by the bounding box is smaller than the
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image, then color1 will be the color of the background.</td>
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</tr>
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</table>
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<p>We also support two convenience defines for setting the linear gradient direction and the radial gradient shape.</p>
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<table class="table table-sm table-striped">
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<tr>
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<td><code>-define gradient:direction=<em>{NorthWest, North, Northeast, West, East, SouthWest, South, SouthEast}</em></code></td>
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<td>Specifies the direction of the linear gradient towards the
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top/bottom/left/right or diagonal corners.</td>
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</tr>
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<tr>
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<td><code>-define gradient:extent=<em>{Circle, Diagonal, Ellipse, Maximum, Minimum}</em></code></td>
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<td>Specifies the shape of an image centered radial gradient. Circle and
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Maximum draw a circular radial gradient even for rectangular shaped images
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of radius equal to the larger of the half-width and half-height of the
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image. The Circle and Maximum options are both equivalent to the default
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radial gradient. The Minimum option draws a circular radial gradient
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even for rectangular shaped images of radius equal to the smaller of the
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half-width and half-height of the image. The Diagonal option draws a
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circular radial gradient even for rectangular shaped images of radius equal
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to the half-diagonal of the image. The Ellipse options draws an elliptical
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radial gradient for rectangular shaped images of radii equal to half the
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width and half the height of the image.</td>
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</tr>
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</table>
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<p>Examples</p>
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<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>
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<pre class="highlight"><code>magick -size 256x128 -define gradient:direction=north gradient:black-white linear_gradient_default.png
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magick -size 256x128 -define gradient:angle=0 gradient:black-white linear_gradient_default.png
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</code></pre>
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<p><img src="../images/gradients/linear_gradient_default.png" width="256" height="128" /></p>
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<p>The equivalent of </p>
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<pre class="highlight"><code>magick -size 128x256 gradient: -rotate 90 linear_gradient_east.png
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</code></pre>
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<p>can be generate by either of the following (or by reversing the direction and swapping color1 and color2):</p>
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<pre class="highlight"><code>magick -size 256x128 -define gradient:direction=east gradient:black-white linear_gradient_east.png
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magick -size 256x128 -define gradient:angle=90 gradient:black-white linear_gradient_east.png
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</code></pre>
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<p><img src="../images/gradients/linear_gradient_east.png" width="256" height="128" /></p>
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<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>
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<pre class="highlight"><code>magick -size 256x128 radial-gradient:black-white radial_gradient_maximum.png
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magick -size 256x128 -define gradient:radii=128,128 radial-gradient:black-white radial_gradient_maximum.png
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</code></pre>
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<p><img src="../images/gradients/radial_gradient_maximum.png" width="256" height="128" /></p>
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<pre class="highlight"><code>magick -size 256x128 -define gradient:extent=minimum radial-gradient:black-white radial_gradient_minimum.png
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magick -size 256x128 -define gradient:radii=64,64 radial-gradient:black-white radial_gradient_minimum.png
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</code></pre>
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<p><img src="../images/gradients/radial_gradient_minimum.png" width="256" height="128" /></p>
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<pre class="highlight"><code>magick -size 256x128 -define gradient:extent=diagonal radial-gradient:black-white radial_gradient_diagonal.png
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</code></pre>
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<p><img src="../images/gradients/radial_gradient_diagonal.png" width="256" height="128" /></p>
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<pre class="highlight"><code>magick -size 256x128 -define gradient:extent=ellipse radial-gradient:black-white radial_gradient_ellipse.png
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magick -size 256x128 -define gradient:radii=128,64 radial-gradient:black-white radial_gradient_ellipse.png
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</code></pre>
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<p><img src="../images/gradients/radial_gradient_ellipse.png" width="256" height="128" /></p>
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<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
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</code></pre>
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<p><img src="../images/gradients/radial_gradient_ellipse_angle45.png" width="256" height="256" /></p>
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