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Blur Rate


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NOTE: This post is based on how I think this whole thing works, and it is more than possible that I am way off but whatever, it should hold some relavence either way.

I was wondering what the blur rate was for most common blurs (gaussian, feather, etc.).

My example assumes you're blending a solid area with a transparent area. However, it would obviously be the same for, say, blue blending into red. I just didn't feel like going through all the different R G and B stuff... cause I really dunno what I'm talking about. o.O

Where:

An = Current Pixel Alpha

An-1 = Previous Pixel Alpha

x = Blur rate depending on distance, and stuff...

Is it simply:

An = An-1 - x

Or does it work on a slightly more complicated formula?

Basically, I'm wondering if it is linear or exponential. If it is only linear, could it be done exponentially? And would that have any realistic use?

HellRiverSig3_stretch.png
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