Any kind of sketchiness on top of some shaded color does the trick. It fools the eye into thinking an artist touched the work when in fact, it was a robot. Sort of like those programs that fool you into thinking you are talking to a human when it is a programmed response.
There's a buzzillion ways to do this line/color extraction in Photoshop and then record the multi-step process with a Photoshop Action once you've arrived at the art effect you want so that it can be consistently applied to all of your presentation images. I can't see how anyone would try to make art without photoshop or a similar software.
The major drawback is that most filters and the Sketch Render overlay thing result in heavy BLACK linework overlaid on color. This always appears sinister and heavy-handed.
Separating linework from color in Photoshop layers permits two artsy things:
- reduce the opacity of the linework over the color, fading the lines to grey-ish
- changing the linework color to a tone complimenting the color theme of the design.
In my book and seminar, I teach about using the Smart Blur filter, taken directly from the book "50 Fast Photoshop CS Tricks." Author: Georges, Gregory. This is a must-buy for anyone experimenting with Photoshop treatments to Archicad imagery.
Dwight Atkinson