#555 – Creating a Radial Opacity Mask

You can define an opacity mask on a user interface element to cause the opacity to change across the element, depending on the mask.  The opacity mask is a brush, where the alpha channel at each point in the brush is used to define the opacity at each point on the element.

You will typically use either a linear or a radial gradient for an opacity mask, since a gradient brush allows you to create a range of alpha values across the brush.

You can use a radial gradient brush as the opacity mask to fade out the edges of a user interface element.  To start with, select a gradient brush for the OpacityMask property.

Change the gradient to be a radial gradient.

Select the outer gradient stop and set its alpha value to be transparent.

Finally, adjust the gradient stops to get the effect that you want.

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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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