Source Image Copyrights:

Confirmation Study:
- "Venice" from grayscale image dataset (http://tobias.isenberg.cc/VideosAndDemos/Martin2010EBS) Copyright Domingo Martín

Main Study:
- "Acinipo" from grayscale image dataset (http://tobias.isenberg.cc/VideosAndDemos/Martin2010EBS) Copyright Domingo Martín
- "Church" from grayscale image dataset (http://tobias.isenberg.cc/VideosAndDemos/Martin2010EBS) Copyright Domingo Martín
- "Foot" from "Stippling by example" demo (http://tobias.isenberg.cc/VideosAndDemos/Kim2009SBE) Copyright the authors
- "Skull" from "Stippling by example" demo (http://tobias.isenberg.cc/VideosAndDemos/Kim2009SBE) Copyright the authors
- "Water Flea" from "Stippling by example" demo (http://tobias.isenberg.cc/VideosAndDemos/Kim2009SBE) Copyright the authors

Pilot Study Acinipo:
- "Acinipo" from grayscale image dataset (http://tobias.isenberg.cc/VideosAndDemos/Martin2010EBS) Copyright Domingo Martín

Pilot Study Water Flea:
- "Water Flea" from "Stippling by example" demo (http://tobias.isenberg.cc/VideosAndDemos/Kim2009SBE)

Protrait Study:
- "Donald Sutherland" (http://www.peterhapak.com/D-Sutherland) Copyright Peter Hapak
- "Emily Blunt" (http://www.peterhapak.com/E_Blunt) Copyright Peter Hapak
- "Robin Williams" (http://www.peterhapak.com/R-Williams) Copyright Peter Hapak