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Showing posts from September 6, 2020

The Devil is in the Details: The Hi-Lo Pass Sharpening Filter for Photoshop

As you can see, the Devil is literally in the details: What is it? The Hi-Lo Pass Sharpening Photoshop Action is ideal for enhancing images cloaked demons, in that it provides a granular access to every detail they contain (by merit of frequency separation) by separating the elements you want to keep as is (in the case of demonic imaging, color) from those you want to change (also in the case of demonic imaging, texture). Is it hard to understand? The technique is pretty basic, and follows the same pattern as nearly every other filter that uses frequency separation to achieve its end. The image is divided into two parts: a high-pass frequency map, which represented by image data is completely gray save a few faint lines made by the objects with sharp-contrasting edges) and a low-pass frequency map, a blurry version of the original image. When separated in this way, changes can be made to certain elements of the image without effecting other elements (such as color a...