Does anyone have a good understanding of the Custom filter in Photoshop?

I heard you can do some really nice sharpening through this method, with minimal halos.

there shld be info in the Photoshop helps. paint shop pro has this also and the helps do help. i just got lost in the math and symbols but did make some sense of it.

craig

KR1156
have a look this thread see if it is any help to you
http://www.retouchpro.com/forums/showthread.php?t=12582
Palms

Almost impossible to explain without throwing in lots of maths and image processing/enhancement jargons :rolleyes: . The first time I saw the default matrix numbers of this filter, it immediately reminds me of a "Mexican hat shape " filter used in Pattern Recognition..kinda convolution process that I used years ago in my research but now it gives me headaches to think about it :hairbow:. You can blur the image by using a "flat top" filter: matrix elements of equal weighting. You can sharpen the image with a "step" shape function....etc. The scale parameter is kinda normalised scaling factor of the filter size.

Anyway if you play with the scale, magnitude or invert the sign of these numbers, or adding extra elements, you will get all sorts of not-so-subtle unnatural effects.

thanks for the replys...very helpful links will have to read into them when i get a chance. after playing around on my own i see theres are many effects that you can get, i'm basically only into sharpening technique...i'm not really into the filtered looks.

thanks