Convolution Filtering

From Ultrafractal Wiki

see also: Reducing Convolution Filter Rendering Time

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From Ron Barnett

What are Convolution filters? If you have used Photoshop and related programs, you probably have used a convolution filter. Here are some common ones:

1. Gaussian Blur
2. Unsharpen Mask
3. Motion Blur
4. Emboss
5. Find Edges/Enhance Edges.

Damien wrote code for the first three to use with images and Orbit Traps Direct. I added the last two. I have found that these filters can also be used with trap shape textures. I wrote a wrapper called Convolution Shape Wrapper to aid in the use of the filters. I have attached a upr that demonstrates their use. The upr has 7 layers. The layers labeled

Base
Emboss
Edge Enhance
Motion Blur

illustrate the use of the filters. When you load the upr you will see the base layer, which has no filter applied. Turn off the base layer and you will see the same texture with Emboss applied. Now turn off the Emboss layer and you will see the texture that has been Edge Enhanced. Finally turn off the Edge Enhance layer and you will see the Motion Blur effect. Make sure you formulas are up to date, especially reb.ulb.

ConvolutionShapeSampler {
; Copyright © 2008 by Ron Barnett.
; tweaks on list ok.
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