Convolution Mask

[Jecca]

Can anyone help me with this problem?
I need to create a convolution mask that will emboss a rectangular button. I am having real trouble figuring out how to do this. The following masks have not worked for me:
-1 -2 -1
0 0 0
1 2 1

-1 0 0
0 0 0
0 0 -1

-1 -1 0
-1 0 1
0 1 1

Thanks

 

[blueark]

The last one should work if you change the centre '0' to a '1'.

 

[mscallisto]

OK you two I simply have to know just what is a convolution mask?

Who knows, I may already need one and I don't even know what it is!!

 

[blueark]

Filter > Other > Custom...

It allows you to create your own filters (although in a pretty limited way). The center box represents a pixel, and the surrounding boxes represent the surrounding pixels. Set the center box to 1 to leave it unchanged, or a larger value to make it brighter. Using scale & offset, you can fine tune the results, and adding values in the surrounding boxes is neccessary to get any worthwhile effect. In this case,

-1 -1  0
-1  1  1
 0  1  0

...this will create an embossed effect.

 

[mscallisto]

Thank you very much, I feel much better now.

 

[blueark]

Whoops! I meant

-1 -1  0
-1  1  1
 0  1  1