Hello, I have a question, If I'm doing the FFT Convolution the right way
because I don't get the wanted results. ( I am using the kissFTT library
for c )

I load an image from a file. I filter out the argv values and put them into two
arrays ( ar[] and gb[] )

they look like this:

ar[0].r = alpha;

ar[0].i = red;

gb[0].r = green;

gb[0].i = blue;

Now let's say the image has a size of 512*512 and I want to convolve it
with a kernel of 50*50;

--I pad out the source image with zeros to a size of 562 * 562 with the source
image in the MIDDLE and zeros on the 4 sides.

--I pad out the kernel to a size of 562 * 562 with zeros so that the actual
kernel values are in the MIDDLE

--I fill the imaginary part of the kernel with zeros

Then I transform ar, gb and kernel into frequency space.

How should I multiply them then? Is it correct to do:

ar[0].r = ar[0].r * kernel[0].r;

ar[0].i = ar[0].i * kernel[0].r;

gb[0].r = gb[0].r * kernel[0].r;

gb[0].i = gb[0].i * kernel[0].i;

?

Please tell me, if I'm thinking right or wrong, and if I have to do any
other steps to perform a convolution on a image;