Custom Channel Separations

October 4, 2008

Here’s an interesting little blogpost from a guy (David Aughenbaugh) that I was chatting with at Siggraph.

http://www.vfxconnection.com/DavidAughenbaugh/blog/

I haven’t had a chance to play with it yet so can’t really attest to how often it applies in real-world situations – be curious to hear what other people think. Still, I’m a big fan of using alternate representations of an image as a method for developing new techniques. I remember when I first discovered all the fun stuff that could be done by tossing something into HSV space and playing with the channels before coming back to RGB.

We always wanted to get some more frequency-based tools into Shake but management had a hard time figuring out how it was going to sell more licenses relative to features that made for good data-sheets. Would’ve been cool…

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2 Responses to “Custom Channel Separations”

  1. Will Summers Says:

    Hey Ron,
    I agree with David that editing in frequency space opens up possibilities. Recently I have been interested in the HDR tone mapping look which is also controlled by an adjustment in the frequency domain.

    I was wondering if you had seen this paper from Siggraph 2008 yet.
    http://www.cs.huji.ac.il/~danix/epd/
    It seems to offer a better algorithm for isolating different frequencies than the high pass filter does. I was wondering if this algorithm could be implemented in Shake.

  2. A Says:

    It’s a very useful technique, but unfortunately they seem to have mangled their website in a redesign. Everything seems to point to his site profile at the moment, but his profile doesn’t have a blog link…

    I can only find the article here:
    http://vfxconnection.com/blog_category.php?blogentrycat_id=2

    You’ll probably need to scroll on a bit, but at least it’s still there 😉


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