convert image.png -resize 40 txt:-|sed -E 's/://;s/\( ? ?//;s/, ? ?/,/g;s/\)//;s/(\w,\w,\w),\w/\1/g;/mage/d'|awk '{print $1,$2}'|python -c "import sys;f=sys.stdin.read().split('\n');f=filter(None,f);print 'tput rev;'+''.join([''.join(map(str,('echo;' if x.split(' ')[0].split(',')[0] is '0' else '','tput setaf '+str(sum(p*q for p,q in zip([36,6,1],[int(min(int(c),254)/42.5) for c in x.split(' ')[1].split(',')]))+16)+';echo -n \" \";'))) for x in f])+'echo;tput sgr0'"|bash
Or, in your profile:
# Display image with tput
function image() {
convert "$1" -resize "$2" txt:-|sed -E 's/://;s/\( ? ?//;s/, ? ?/,/g;s/\)//;s/(\w,\w,\w),\w/\1/g;/mage/d'|awk '{print $1,$2}'|python -c "import sys;f=sys.stdin.read().split('\n');f=filter(None,f);print 'tput rev;'+''.join([''.join(map(str,('echo;' if x.split(' ')[0].split(',')[0] is '0' else '','tput setaf '+str(sum(p*q for p,q in zip([36,6,1],[int(min(int(c),254)/42.5) for c in x.split(' ')[1].split(',')]))+16)+';echo -n \" \";'))) for x in f])+'echo;tput sgr0'"|bash
}
then, on file or url (replace 64 with the width you want):
image image.png 64
This one-liner has ImageMagick resize and convert the image into a list of pixel data, which are filtered and piped into inline python as a raw list of x,y r,g,b where rgb values are mapped to a terminal color space and then rendered into a string of tput and echo commands, which are finally executed by bash. Note that this violates every conceived notion of efficiency, practicality, readability and maintainability. If you have mission-critical terminal imaging needs, the caca-utils package can probably help.
The colors, which are the 'web-safe' colors, can be viewed here without ImageMagick:
n=6;for r in $(seq 16 $n 231);do echo "$(for c in $(seq $n);do v=$(($r + $c - 1));tput setaf $v && echo -ne $(printf "%03d" $v);echo -n ' '; done)";done
n=16;for r in $(seq 0 $n 255);do echo "$(for c in $(seq $n);do tput setaf $(($r + $c - 1)) && echo -ne '\xE2\x98\x85 ';done)";done
