Scripts for running Conway's Game of Life on arbitrary input images

life.sh

#!/bin/bash

# 1. quantize input image to 3-bit colors (WRGBCMYK)
# 2. start the image stack
# 3. split into 3 channels (RGB)
# 4. apply 1 generation of the game of life to each channel
# 5. rejoin the 3 channels, append to image stack
# 6. loop to point 3 n times
# 7. output the image stack as an animated GIF

# 1. quantize the input image to 1-bit instead
# later: remap colors after

convert -size 21x1 xc:black -fill white \
          -draw 'point 3,0  point 12,0  point 13,0' \
          /dev/shm/life_clut.gif

# magick $1 -resize 480x640\> -colors 2 -colorspace Gray -ordered-dither o8x8 -normalize /dev/shm/life_loop.gif

magick $1 -resize 480x640\> -colors 2 -colorspace Gray -dither FloydSteiberg -normalize /dev/shm/life_loop.gif

for i in `seq 20`; do
    if [ $i = 1 ]; then
        magick /dev/shm/life_loop.gif \
        -write /dev/shm/life_loop.gif miff:-
    else
        convert /dev/shm/life_loop.gif -define convolve:scale=0.05 \
            -morphology Convolve '3:1,1,1 1,10,1 1,1,1' \
            /dev/shm/life_clut.gif -interpolate integer -clut \
            -write /dev/shm/life_loop.gif miff:-
    fi
done | convert - -set delay 50 -layers Optimize -loop 0 life_anim.gif

life_color.sh

#!/bin/bash

# 1. quantize input image to 3-bit colors (WRGBCMYK)
# 2. start the image stack
# 3. split into 3 channels (RGB)
# 4. apply 1 generation of the game of life to each channel
# 5. rejoin the 3 channels, append to image stack
# 6. loop to point 3 n times
# 7. output the image stack as an animated GIF

# 1. quantize the input image to 1-bit instead
# later: remap colors after

convert -size 21x1 xc:black -fill white \
          -draw 'point 3,0  point 12,0  point 13,0' \
          /dev/shm/life_clut.gif

# magick $1 -ordered-dither o8x8,2 /dev/shm/life_loop.gif

magick $1 -resize 480x620\> -dither FloydSteiberg -posterize 2 /dev/shm/life_loop.gif

# convert life_loop.gif -separate \
# 		\( -clone 0 \
# 			-define convolve:scale=0.05 \
# 			-morphology Convolve '3:1,1,1 1,10,1 1,1,1' \
# 			/dev/shm/life_clut.gif -interpolate integer -clut \
# 		\) -delete 0 -insert 0 \
# 		\( -clone 1 \
# 			-define convolve:scale=0.05 \
# 			-morphology Convolve '3:1,1,1 1,10,1 1,1,1' \
# 			/dev/shm/life_clut.gif -interpolate integer -clut \
# 		\) -delete 1 -insert 1 \
# 		\( -clone 2 \
# 			-define convolve:scale=0.05 \
# 			-morphology Convolve '3:1,1,1 1,10,1 1,1,1' \
# 			/dev/shm/life_clut.gif -interpolate integer -clut \
# 		\) -delete 2 -insert 2 \
# 		-combine \
# 		life_gen_001.gif

for i in `seq 20`; do
	if [ $i = 1 ]; then
		convert /dev/shm/life_loop.gif miff:-
	else
		convert /dev/shm/life_loop.gif -separate \
			\( -clone 0 \
				-define convolve:scale=0.05 \
				-morphology Convolve '3:1,1,1 1,10,1 1,1,1' \
				/dev/shm/life_clut.gif -interpolate integer -clut \
			\) -delete 0 -insert 0 \
			\( -clone 1 \
				-define convolve:scale=0.05 \
				-morphology Convolve '3:1,1,1 1,10,1 1,1,1' \
				/dev/shm/life_clut.gif -interpolate integer -clut \
			\) -delete 1 -insert 1 \
			\( -clone 2 \
				-define convolve:scale=0.05 \
				-morphology Convolve '3:1,1,1 1,10,1 1,1,1' \
				/dev/shm/life_clut.gif -interpolate integer -clut \
			\) -delete 2 -insert 2 \
			-combine \
			-write /dev/shm/life_loop.gif  miff:-
	fi
done | convert - -set delay 50 -layers Optimize -loop 0  life_anim.gif

# One concern was the flashing and blinking of the patterns. '50' is a half-second framerate, which should be much safer. https://developer.mozilla.org/en-US/docs/Web/Accessibility/Seizure_disorders