Edge Detection of Image in iPhone Using Image Magick

Question

I want to convert RGB image into Below Image. I am using ImageMagick Library . I want help to know that by which functions i can convert in Original Image into Image-2. Here

Answer 1

There's no way to be sure if that image was even generated with Image Magick. But if you read this answer, it's worth taking a look at the charcoal filter:

convert holocaust_sm.jpg -charcoal 5 charcoal.gif

My suggestion is that you also experiment with thresholds, and take a look at the Children's Color-In Outline Image example, since I believe it wasn't a single filter that achieved that effect (assuming it was generated by IM).

After researching for a while I believe that an effect like the one you are looking for could be achieved through a mixture of several filters. You must check this page, which presents a huge collection of cool effects using IM.

This is my attempt:

convert ms8nP.png -colorspace Gray -blur 0x.7 -negate -edge 2 -negate -threshold 40% -blur 0x.5 out.png