This is very cool @christinaa and thanks for the shoutout! I haven't got matlab but I'm may try to port some of your samples into C# or Python, so it's good you post the code blocks here. I'm really looking forward to your series.

I will be showing my age here, but many of the image processing techniques started with film. For example unsharp masking was done by taking out-of-focus copy of a negative and then using that as a mask in front of the original negative to sharpen a image. Photographic dodging was another technique where you'd get a paper-clip with a bit of putty on the end as a blocking tool to fade out parts of the image when you printed it in an enlarger. Of course hardly anyone would do it this way now...