Fwd: Convolution

Boudewijn Rempt boud at valdyas.org
Thu May 26 09:48:40 CEST 2005

On Thursday 26 May 2005 07:12, Casper Boemann wrote:
> I wuld like to warn against per channel kernels.
> I actualy changed it from 4 to one a while back.
> The reason is colorspace independence.

Also, I've done a pretty extensive search for convolution in the past few 
days, and I've never found a place where per-channel convolution kernels were 
actually used. On the other hand, I found quite a few references to bigger 
kernels than 3x3.

Of course, some specific color strategies might want to create a filter that
only perturbs a specific channel (say, the water content), so we might have to 
add a channel-specific applyMatrix at one time.

Boudewijn Rempt 
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