Most impressively of all, the way this illusion works doesn't seem to require static images. Black And White Colour, Black White Stripes, Black And White Photography. "The raster of dots gives a nice analogy to half-toning as used in print, where colour assimilation aids the optical mixture of colours that already happens before our visual system gets involved," Kolås explains on his Patreon page.Īnd here's an example using lines to create the same effect:Īnother one, with horizontal lines instead of a grid. While Kolås finds grids offer the best effect, he's also played around with other ways of achieving the visual trick, using alternatives like dots and lines: The illusion isn't just created by using coloured grids, either. Vector Illustration (EPS10, well layered and grouped), wide. Some of the people in that photo hadn't given permission for it to be shared online, and Kolås has asked for it not to be used, which is why we've put up one of his other examples instead. Geometric texture for your design (colors used: white, gray). If you've seen this illusion doing the rounds, you might notice this isn't the main image being shared. Or, you might say, a little bit of colour goes a long way. In other words, our brain kind of compresses visual information when we look at things, giving us an overall impression of what's there if we don't take the time to examine objects closely. "So the grids get 'averaged' with the achromatic background, which then gets attributed to that part of the image." "The colour system is what vision scientists refer to as 'low pass', i.e., many of the receptive fields that code colour are quite large," Anderson told ScienceAlert. So what's going on here to make our brains actually interpret this black-and-white picture as if it's full colour image?Īccording to vision scientist Bart Anderson from the University of Sydney, the effect we're seeing in this illusion isn't particularly surprising. "An over-saturated coloured grid overlaid on a grayscale image causes the grayscale cells to be perceived as having colour," Kolås explains on his Patreon page. Kolås is making the technique available via GIMP as an operation called color-assimilation-grid, available starting with the next GIMP-2.10 release, meaning you can try it out on your own images.Created by digital media artist and software developer Øyvind Kolås as a visual experiment, the technique, which Kolås calls the 'colour assimilation grid illusion', achieves its effect by simply laying a grid of selectively coloured lines over an original black-and-white image. ut it uses the same principle that Chroma Subsampling does, that luminance is a lot more important than the chroma for our visual perception. This is not the exactly same as the way JPEG compression works, since in JPEG compression the lower resolution color signal is present for in every reconstructed pixel, in this illusion the reconstruction is happening in our eyes/mind. It was converted to black-and-white, before being overlaid with red, orange, yellow, blue, and green grid lines.Īn over-saturated colored grid overlayed on a grayscale image causes the grayscale cells to be perceived as having color.īelow is another image from Kolås, created using the same process: The photo itself is one licensed through Creative Commons, originally taken by Chuwa (Francis). The experiment comes courtesy of GIMP’s open-source image editor project artist and developer Øyvind Kolås, and has been picking up traction on the internet this week. There are several ways you can look at this photo stepping back and glancing at it from afar, or squinting while staring at it can both enhance the colors you see.
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