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A different type of filter

June 2011: This technique is so elegant that you may hear yourself ask, "Who was that masked High Pass filter?"
Before-and-after
These before and after images show the results of using the author's technique of masked High Pass filtering on astroimages. Tony Hallas
Some years ago, imagers discovered a new way to enhance the detail in an astrophoto that proved superior to the unsharp mask in Photoshop. Follow me through these steps to uncover the power of what I call masked high-pass filtering.

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