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Made with:
#!/bin/bash
# selfi.sh - strongly influenced by Interstellar Selfie Station
# http://interstellarselfiestation.com
# scruss - 2014-06-26
anytopnm "$1" |\
pnmscale -xsize 160 |\
pnmhisteq |\
ppmdither -red 4 -green 4 -blue 4 |\
pnmremap -mapfile < (echo P3 4 1 255 108 108 78 142 139 97 195 196 165 227 230 201) |\
pnmscale -nomix 2 |\
pnmtopng > "${1%.*}-selfi_sh.png"
Update, 2021: well, who knew that software that purportedly hasn’t changed since 2001 (netpbm on Debian) would change? This script broke between 2016–2021, and I had to remove the ppmtopgm line that was after the ppmdither call to make it work again.