Following up with my exploration of gradient_norm here and here…
As I am having fun with G’MIC, I have been noticing that the appearance of gradient_norm heavily depends on the size (and contents) of the image.
This is a problem because what works for a small image won’t work for a large one. E.g., when I apply the same command to PlayRaw images, it doesn’t work because I have been playing with G’MIC sample images, which tend to be much smaller and more idealized.
One approach might be to resize the image. Take sample flower for example. The difference between #1 and #2 is that I doubled the size of #2 before applying gradient_norm and shrinking it back to size. (Actually, #1 vs #2 of flower might not be the best example; it still looks okay.)
With this strategy, I am able to thin the outline. So, I now know that I can manipulate the width of the outline by doing this. However, the details and intensities change resulting a different effect on the image, and this would compound as you chain more commands.