Sign & Digital Graphics

February '18

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44 • February 2018 • S I G N & D I G I T A L G R A P H I C S DIGITAL PRINTING AND FINISHING DIGITAL GRAPHICS superimposed identical line drawings, one in blue and the other in red. When viewed through red and blue glasses, the drawings merge and appear to be three- dimensional. This particular type of 3D is called anaglyphic. I personally became interested in anaglyphic 3D when I was a kid in the 1950s. I had several 3D Mighty Mouse comics that I would look at over and over again to try to understand how these red, blue and black line drawings magically displayed depth (see Figure 3). Anaglyphic 3D 101 Anaglyphic 3D is a type of stereo- scopic 3D produced by means of plac- ing a differently colored filter in front of each eye. The filters are typically red and cyan. Anaglyphic 3D images contain two images, one red and the other cyan to correspond with the filters on the glasses. The color channels on images are offset with red being moved slightly to the left. There is usually a base image too, which can be black and white or full color. When viewed through the anaglyphic glasses, each eye sees one of the two col- ored images. The left eye bearing the red filter sees the blue image that appears black. The red image is not visible because it is filtered out. Similarly the right eye sees the red image, appearing as black and the blue image is filtered out. The visual cortex of the brain integrates the two images into a single stereoscopic image and perceives it as a three-dimen- sional composition. Applications Anaglyphic images have seen a recent resurgence due to their use on the Web, Blu-ray discs, CDs, and even more so in print. Video games, and films on DVD or Blue Ray can be shown in anaglyphic Figure 3: Anaglyphic 3D comics were first published in the 1950s. Figure 4: Anaglyphic 3D images are often used for scientific imaging in medical and anatomy books where depth percep- tion is critical. (Image from "Stereoscopic Three-Dimensional Visualization Applied To Multimodal Brain Images," original research published Nov. 2014 in the journal Neuroscience. Authors: G. Rojas, M. Gálvez, N. Vega Potler, R. Craddock, D. Margulies, F. Castellanos, M .Milham) Figure 5: NASA images, including pictures from the Mars Rover, have been processed using anaglyphic 3D. (Image courtesy of NASA) Figure 6: Anaglyphic 3D printed on underwear.

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