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Photoshop filter simulates colorblindness

MacWorld Online

(IDG) -- Colorfield Digital Media, a new Pittsburgh, Penna., company, has announced the release of Colorfield Insight 1.0, a $79 Adobe Photoshop filter that allows designers to simulate the effects of colorblindness when viewing images. The filter is available now for purchase online.

The company notes that about seven percent of the male population suffers from visual color deficiency (it is extremely rare in women). The filter gives designers an idea of how images will appear when colorblind people view them.

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We view color using three types of photoreceptors in the retina: S-cones, M-cones and L-cones. In dichromatic vision, one of these photoreceptors is missing, in the more-common anomalous trichromancy, sensitivity shifts among different types of cones, making it difficult to distinguish certain colors. The filter presents the image as viewed by someone with dichromatic vision, but the developer said the effect is similar to viewing the image with the less-severe form of colorblindness. You can choose from displaying the image as seen with an S-cone (tritan), M-cone (deutan) and L-cone (protan) deficiency. (M-cone and L-cone deficiencies are known as "red-green" colorblindness because they make it difficult to distinguish those colors. Rarer S-cone deficiencies affect the ability to distinguish yellow and blue.)

Colorfield's Web site includes galleries of images showing how they appear when the filter is applied. You can also download a free trial version. The filter is compatible with Adobe Photoshop, Illustrator, ImageReady, After Effects and Macromedia FreeHand.



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