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The Mask: Images
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Even though Amount is at the top of the set of controls in the Unsharp Mask dialog, you should generally start with the Radius control. An image with fine detail will need a lower Radius setting while one with less inherent detail can utilize a larger Radius. Start with a Radius between about 1.0 and 1.5 and go from there, lowering the setting perhaps to 0.5 or even lower for images that start with fine details, or raising it to perhaps 2.0 to 4.0 for images with lower levels of inherent detail.
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This step-by-step article describes how to set the Mask and the Picture properties of a Microsoft Office 2003 CommandBar control from a managed code extension that is created with Visual Studio Tools for the Microsoft Office System. The Picture properties permit you to set the image that appears on a CommandBar control. The Mask properties may be used to create a transparent background for that image.
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Because opacity masks are “hidden” deep within the Transparency palette, they are a feature that doesn’t get much publicity. However, they are really one of the most sophisticated features you’ll find that offers a wide range of functionality. If you truly understand that opacity masks are just levels of gray that determine visibility, you can use these to achieve effects that you once thought were only possible in Photoshop. Take photographs for example. By using a vector object with a Feather live effect applied to it, you can create a soft-edged vignette for a placed photograph right in Illustrator. Additionally, you can use placed images themselves as an opacity mask, which opens the door to creating Photoshop effects like mezzotints and halos (Figure 10).
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With Raster1 the active layer, choose Layers > New Mask Layer > From Image. For 'Source window', choose the file ID of the image that you want for the basis of your mask. Be sure that 'Source luminance' is selected under 'Create mask from'.
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Hundreds of mask images are available through the Stanley Collection's Art and Life in Africa site. After entering the site, scroll down the main page and click on "Search the Stanley Collection of African Art Database." Under the "Type" section, select "masks" from the pull-down menu.
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