This tutorial is intended for those who have Photoshop CS or CS2. Open a landscape image, whatever you want. This is my image.
First time, go to Image> Adjustments>Shadow/Highlights and in the pop-up menu that will appear move the slider of Shadows to maximum (100%) and the Highlights one to minimum ( 0%) like in the example.The image may look a little too bright in places but that doesn't matter.
Next go to Filter>Stylize>Find Edges. All the edges will now become outlined.
Choose Edit>Fade Find Edges (This option will only be available at this point, if you do anything else between Find Edges and Fade, you won't be able to do this). Change the blending mode to Luminosity. This will restore the colors (Don't close the dialog yet). Reduce the Opacity slider until you are happy with the result. I used 44% for this image.
There you have it, in 3 easy steps we have created a classic painting. Here is the final:
