Image Data - Black and White Example, by Brent M. Dingle

HTML5 and JavaScript are used to create a black and white version of the original image. Using a 'luminance' algorithm of: 0.3*red + 0.59*green + 0.11*blue

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Above Example by: Brent Dingle

See also this article, by Tanner Helland, offers a good presentation of various methods to convert an image to greyscale - and the reasoning behind each.