I used GIMP to transform a photo of my horses into a sketch!
First, open gimp and drag the photo you wish to use into the GIMP screen. Now click “duplicate layer” under the “Layer” tab.
Next go to the “colors” tab and choose “desaturate.” (When the dialogue box pops up choose “lightness” and click “ok”) All color should now be gone!
Now click on the “filters” tab ? “edge-detect” ? “edge”
Once you do this, a window will pop up:
Now your screen should look something like this:
Next, you need to click on the “colors” tab and then “invert”
And you get:
Now if you want to take it a step further and add a little bit of color:
Go to the “Layers-brushes” window…
And now we have our final product!
I hope these directions help, Please let me know!