4N wrote:
photoshop isn’t opensource so none knows how things work inside it, anyway smartblur works like this:
to blur a pixel in regular blur you simply take the pixels surrounding it, you sum their values then you divide by the number of pixels summed up.
I don’t think it’s that simple. Take an empty white document, zoom in 1600% (maximum zoom) en place one black pixel in there with the pen tool. Now use Gaussian Blur at 1 pixel. Your ‘formula’ suggests you would get an even colored 3 x 3 pixel grey square, but in reality you don’t. You do get a 3 x 3 pixel quare, but with a dark grey centre pixel, four side pixels that are lighter grey and four corner pixels that are even lighter. That suggests a more complicated formula IMHO.
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Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer
http://www.johanfoto.com