![]() (We’ve written and tested it under Processing version 2.0b6 other versions may work as well.)Īnd as we mentioned, there are also already plenty of good applications that perform Atkinson dithering for still photos: The program is a “sketch” file that runs within Processing, which you can download here for your operating system. You can download the two versions of our program here. The other, shown above slightly reduced, is just 512×342, with rounded corners and a black border- giving you live dithered video, the same shape and size as an original Macintosh screen. One runs with full resolution in a modern 800×600 window. There are actually two versions of our “mirror dither”program, at different sizes. Windell demonstrates the “right hand rule,” a common gang sign amongst physicists. The Atkinson dithering algorithm itself is a modified version of Floyd-Steinberg dithering, where the “error” between the intended gray level at each pixel and the black or white dot that is actually drawn at each pixel is distributed to neighboring points. The net result is quite surprising, because dithered images like these feel like they should only exist in an era long before webcams and computer video. With Atkinson dithering, grays and detail are preserved well, but bright and dark regions tend to be washed out. Screen shot: Zener grudgingly sits in front of the webcam for dithering. Today we’re releasing a neat little Processing sketch that takes video from your webcam and performs Atkinson dithering on it in real time, to produce live video continuously processed with the effect. There are already a number of neat applications (listed below) that can perform Atkinson dithering on source images. Those grays were often represented by various types of dithering patterns, of which one of the most classic is Atkinson Dithering.Ītkinson Dithering is named after Bill Atkinson, the developer of classic Macintosh applications MacPaint and HyperCard, where this type of dithering contributed heavily to the look and feel of computer images in the era. I found values of 0.8 to 1.2 are good for contrast if you want lighten or darken specific areas.Once upon a time in the 1980’s, computers had 1-bit displays, and the world was in (at least, so we understand from the pictures) gray scale. Remove the space and surround the argument by quotes. If you want to go negative, I found that specifying the option like -c"-1" will give you minus 1. ![]() Negative numbers for contrast invert the image. Numbers larger than 1 increase sharpness/contrast, numbers below 1 reduce it. If image is scaled from the resized pre-dither image if the -r option was specified.įor contrast and sharpness, 1 is default and does not need to be specified. Makes output image twice as large as the pre-dither image. ![]()
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