I should have a 2d line chart, and I should be able to draw magnitude at each frequency. It rotates and filters. Right now, a line chart consists of 1 between two frequencies, and 0 elsewhere.

Or I should have a 2d image, and I draw dark/light. It reflects appropriately to get the other half, and multiplies the image (without rotating). Right now, this image looks like a donut.

I'm drawing the filter, you see. It applies the filter, and shows me:

* The source image FFT(what I drewFFT(image))

The point spread function / convolution kernel FFT(what I drew)