just make sure your kernel is allocated using fl_get_matrix():
int **kernel = fl_get_matrix(3,3,sizeof(**kernel));
kernel[0][0] = whatever,
kernel[0][1] = ...
the document did not make the fact the kernel has to be
a pointer to pointer to int. I'll add a function
that takes the C 2-d array kernel[3][3].
The built-in smoothing kernel is something like the following:
1 2 1
2 7 2
1 2 1
--- Ravi Mehrotra <ravi@csnpl.ren.nic.in> wrote:
> # To subscribers of the xforms list from Ravi Mehrotra
> <ravi@csnpl.ren.nic.in> :
>
> Hi,
>
> I would like to know how flimage_convolve is set up. In particular
> how the kernel operates on the image and what the normalization
> factors usedi are.
>
> To test, I used a 3X3 kernel with the center element unity and all
> others zero. I thought that I would get the original image back but I
> got all zeros in the convolved image.
>
> What are the kernels used for FLIMAGE_SHARPEN AND FLIMAGE_SMOOTH ?
> By the way these symbolic constants are wrongly defined as FL_SMOOTH
> and FL_SHARPEN in the forms.h header file.
>
> Thanks.
>
> Ravi Mehrotra
> National Physical Laboratory
> New Delhi, India
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