Re: Smoothing?

"DaveWilson" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> so if that code uses the low pass filter (1 1 1) (1 1 1) (1 1 1)
> smooths
> why doesn't (0 1 0) (1 -4 1) (0 1 0) sharpen the image? according to
> sources i've found that filter applied in the same manner should
> sharpen an image?
>
>


Except that it isn't applied in the same manner. The scaled result of the
high-pass filter should be *added back* to the original pixel value at that
position to sharpen the image. In the previous examples, the output of the
filter *replaces* the original value.


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EMail: roger dot rowland at rmrsystems dot co dot uk