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#!/bin/bash
pngtopnm tools/rock_overlay@2x.png | pnmnorm | pgmtoppm "#000000-#111111" | ppmquant 2 | pnmtopng > tools/texture_mask.png
convert tools/texture_mask.png -alpha copy -fx '#fff' images/texture.png
zopflipng -m -y images/texture.png images/texture.png
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