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Adventures in mapmaking: the search for grayscale tiles
All I want is a tileset that's free to use and grayscale
My invader map is used to help collecting the mosaics in the real world via an AR smartphone app. I went through all of the options there with just two criteria in mind: 1. free to use and 2. black&white or grayscale, to preserve the distraction-free aesthetics of the map. The visual transformation to grayscale is done on the client using pure CSS, much more efficiently than the pixel-by-pixel method using the JS plugin.
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