Edges — OZONE Asylum, home of the Mad Scientists

Edges

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Your Text: Insert Slimies » Insert UBB Code » Close Last Tag \| All Tags UBB Help	Tao, get to playing because here come more. ---- Find Edges and Noise Find Edges is pretty noisey. As Public Enemy said many years ago, "Bring the noise!" A few years later, Anthrax gave them a hand. Find Edges will do that in spades. Ugh. Before You can blur before the fact to get rid of very high noise. Blur, Blur More, or Gauss with a low radius. Personally, I prefer Blur More. If you opt for Gauss, a slightly higher (relative) radius can cause some 'rounding' of the 2d data. This rounding goes back to Kai's well known Gauss + Levels combo. Another option is Median. Median will largely respect edges, but can cause blotchiness or banding. I use Median when dealing with raw hues because no new values are introduced within the radius. If you extract raw hues and Gauss, you will get intermediate values all over the place (Snowy Mask on crack) and this can be bad. Median avoids that all together. After Back to desaturating for a bit. For finding Min/Max, Apply Image with Darken/Lighten is used. That is a very specific calculation. Who says you have to use Darken/Lighten? Try Screen/Multiply for a little extra oomph. For even more oomph, try Add/Subtract. For Apply Image and Add/Subtract as we are using them for this, use Subract and check the Invert option. R > Apply Image: G Subtract Invert R > Apply Image: B Subtract Invert After all that, whichever way you go, there is a good chance you will be left with artifacts and some noise. Even with pre-blurring, you will probably end up with noise. Lots of ways to deal with it, but I want to show you a bit of a power trick. Seriously, this is a power function. Once you have your noisey edges, give is some Gauss, like around 4 or whatever to start. Then Edit > Fade Gauss using Mode: Colour Dodge and bring Opacity down to taste. - Filter > Blur > Gaussian Blur using 4-ish - Edit > Fade Gaussian Blur -- Mode: Colour Dodge -- Opacity to taste That should go a long way to getting ride of post noise. Will even adjust the choke a bit as a bonus. Yeah, it's a bonus. It's not a bug! Another thing I'm big on is fixing little things and letting them add up to a bigger and better whole. Fix a little bit of the noise before Find Edges, fix a little bit of the noise after Find Edges - OMG uber squeaky clean. Notice that I didn't mention using Levels/Curves/Contrast et al to clean the post noise? Hehehe. Now that most of the brain ticklers are out, I'm thinking I'll give LaPlacian a quick whirl. This should be pretty quick-n-sleazy. Until then play.fiddle.learn [img]http://cablespeed.com/~jlhalmich/ozone/koopaisgreater.gif[/img] Loading...
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