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Since we know about convolution filter in image processing, it is basically a matrix applied to an image and a mathematical operation comprised of integers and it works by determining the value of a central pixel by adding the weighted values of all its neighbours together.

Question: In Envi software, we apply a convolution filter by going under the Filter > Convolutions and Morphologytab, Now there we have a default 3×3 LPF (low-pass filter) and HPF(High pass filter), On the basis of their usage/kernels, how exactly these filters works?

Note: I am a beginner in image processing so need a basic explanation.

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