Variable Frequency — OZONE Asylum, home of the Mad Scientists

Variable Frequency

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Your Text: Insert Slimies » Insert UBB Code » Close Last Tag \| All Tags UBB Help	Okay, let's do a little warm-up exercise with variable sharpening. The most common method of sharpening is using frequencies. There are several ways of manipulating frequency. The aspect we will be manipulating is the frequency itself as opposed to amplitude. Here is the image: [img]http://tech-slop.serveit.org/wiki/images/varfreq01.jpg[/img] Just some guy that I got from a stock photograph CD. I've used this guy before and he's better for this than Biker Chic. Can I get a moment of silence for Biker Chic? ... Thank you. Now, we can go back-n-forth between Gauss and High Pass. Since we have Lens Blur, which can do variable Gauss, we'll be using that to get variable High Pass. That is, the higher the blur radius, the higher the sharpening radius. So I spent a few minutes just painting some greyscale. I don't want the beard sharpened with too much of a radius, so it gets a lower value of grey. Other parts of his face I want to sharpen at a higher radius, so it gets a higher value of grey. I want his hair line just a tad, so it gets a very low shade of grey. Just for fun, I get the tip of his collar a high radius and then kind of faded it to black the closer it gets to his neck. Didn't want to sharpen the background at all, so that's all pure black. I very quickly used the Smudge tool to so some crude blending. Very quick-n-sleazy. Here is my final blur mask: [img]http://tech-slop.serveit.org/wiki/images/varfreq02.jpg[/img] Chucked it into an Alpha channel. Loaded up Lens Blur and used the Alpha. Made sure my settings were to blur white and not blur black. Used a radius of 25. This is what I get after Lens Blur: [img]http://tech-slop.serveit.org/wiki/images/varfreq03.jpg[/img] As you can see, that is the DOF effect that Lens Blur was intended for. Once done with Lens Blur, go through the Linear Light @ 50% thing. What am I left with? A single sharpening layer to play with: [img]http://tech-slop.serveit.org/wiki/images/varfreq04.jpg[/img] Now it's just a matter of blending modes and what-not. Keep in mind that what was manipulated was frequency - not amplitude. [small](Edited by [url=http://www.ozoneasylum.com/user/351]warjournal[/url] on 06-11-2006 00:50)[/small] Loading...
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