SVG Image Masking

<svg width="450" height="320" version="1.1" xmlns="" style="border-style:solid;">
<radialGradient id="fade">
<stop offset="0%" stop-color="white" stop-opacity="1.0" />
<stop offset="50%" stop-color="white" stop-opacity="0.7" />
<stop offset="100%" stop-color="white" stop-opacity="0.0" />

<mask id="fademask">
<ellipse cx="225" cy="150" rx="225" ry="150" fill="url(#fade)" />

<image xlink:href="" x="0" y="0" width="480" height="353" mask="url(#fademask)" />

Masking is a similar to clipping, except that clipping defines an area of a graphic element that will be visible and makes a sharp boarder between the visible and clipped areas. A mask defines an area where each pixel of the mask has a degree of transparency and opaqueness that lets some of the graphic element show through, making a blurry boundary between the visible and masked areas.

In the example shown above, a radial gradient is defined and given an id of "fade". A mask is defined and given an id of "fademask". The radial gradient is then used as the fill of the mask. The image leaves.jpg is then loaded with xlink:href and the mask is used with the mask attribute in the leaves image tag.

A mask works by using its alpha channel to allow or block pixels of the image from showing through. The less opaque a part of the mask is, the less visible that part of the image will be. you can make the mask stop-colors any color you like, but it will turn out white in the result because mask uses only the transparency bits of the mask.

Learn more at

More Graphics Design Tips:
• Getting Started with Blender
• Coding Color for the Web
• Basic Inkscape Text
• SVG Image Clipping
• Five Surprising Reasons I Use Krita for Photo Editing
• Introduction to Draw SVG Free Online SVG Drawing Application
• Paint.Net Ink Sketch, Oil Painting, and Pencil Sketch Artistic Effects
• Introduction to X3D (Extensible 3D)
• How to Create a Game App
• Inscape Text in a Shape