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Review: Optipix

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Old 10-25-2002, 08:06 PM
Stephen M Stephen M is offline
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Join Date: Apr 2002
Location: Sydney, Australia
Posts: 439
1/2 & 1/3 Pixel Nudge Custom Convolution

An update - I lamented that I had lost the 'sub pixel motion' convolution kernels that were from a defunct website...but with a very extended search and quite a bit of luck - I have found what seems to be an online 'archive' of the site, even though it is no longer running (or appears to be no longer running).

Anyway - the links still work (for now) and you can download the custom convolution kernels here:

With the recent EXCELLENT posts from Chris Russ on custom convolution (see link below) and his great free custom 'custom' convolution filter I will shortly experiment with these kernels with more understanding than in the past (thanks Chris), I just wanted to share the links first!

Looks like I'm turning into a convolution geek - when I am a diehard GUI person. <g>

Stephen Marsh.
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Old 10-25-2002, 08:46 PM
Stephen M Stephen M is offline
Senior Member
Join Date: Apr 2002
Location: Sydney, Australia
Posts: 439
Quick Test Results of Sub Pixel Motion Convolution:

Rasterized EPS font, 3pt black Times text and also inverted (very small fine serifs) -

Did a offset filter of 1 pix and a 50% opacity fade and compared it to the custom filter convolution kernel for 1/2 pixel...

The custom convolution method is the winner - sharper serifs and fine detail (which the fade command with the offset filter blurs slightly more), although printing may not show the is probably a big deal though when stitching or aligning images, which is probably where Chris is coming from with his third party nudge filter in the Optipix plug-in package.

Stephen Marsh.
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