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Library: Creative Design


Avoid transparent edges in blurred selections with Photoshop's Modify command

Added on Tuesday 4th of August 2009 09:23 am EST

Application > Adobe Photoshop CS/CS2
Operating Systems > Macintosh, Microsoft Windows

I find that the Blur command is a great tool to use whenever I want to obscure an image background from a subject. Generally this works well except when I have to use a high blur value. In those cases, I notice that the edge of the blur selection becomes transparent and the underlying layer shows through. Is there any way to avoid this?

The Blur command is indeed an effective way to shift the visual focus in an image away from a strong or conflicting background to your central subject. As you suggested, when the detail in the background is strong you have to use a substantial amount of Blur effect to subdue the background enough. When you do, you often notice that the edge of the blur selection becomes transparent and then the layer below it begins to show. This is due to the way the command works by averaging adjacent pixels to produce the blur effect. When pixels at the edge of a selection are averaged with transparent areas, they likewise becom...