cat image on xterm256 terminal, zsh or bash

readme.md

catimg(bash)

#!/bin/bash
# Modified by Yu-Jie Lin for Bash from zsh version
 
ORG="$1"
 
if [[ ${ORG##*.} =~ JPG|jpg|JPEG|jpeg|GIF|gif|PNG|png ]]; then
 
  CATWIDTH=$(tput cols)
 
  SRC=$(mktemp).png
  convert -resize $(( CATWIDTH / 2 ))x "$ORG" "$SRC"
 
  W=$(identify "$SRC" | sed -e 's/^.* \([0-9]*\)x[0-9]* .*$/\1/g')
 
  I=0
 
  convert "$SRC" -crop 1x1+$W txt:- 2>/dev/null |
  sed -e '1d;s/^.*(\(.*\)[,)].*$/\1/g;y/,/ /' |
  while read R G B _; do
    ((
      I++,
      IDX = 16
          + R * 5 / 255 * 36
          + G * 5 / 255 * 6
          + B * 5 / 255
    ))
    echo -ne "\x1b[48;5;${IDX}m  \x1b[0m"
    (( $I % $W )) || echo
  done
 
  rm "$SRC"
 
else
 
  cat $@
 
fi

catimg(zsh)

#!/bin/zsh
# Orginal by geta6

ORG=$1

if [[ ${ORG##*.} =~ '(JPG|jpg|JPEG|jpeg|GIF|gif|PNG|png)' ]]; then

  CATWIDTH=128

  SRC=/tmp/termtmp.png
  convert -resize $(( $CATWIDTH / 2 ))x "$ORG" "$SRC"

  INF=`identify "$SRC" | sed -e 's/^.* \([0-9]*x[0-9]*\) .*$/\1/g'`
  W=`echo "$INF" | cut -d'x' -f1`

  INF=`convert "$SRC" -crop 1x1+$W txt:- 2>&/dev/null`
  INF=`echo $INF | sed -e 's/^.*(\(.*\)[,)].*$/\1/g' | sed -e 's/,/ /g' | sed -e '1,1d'`

  I=0

  RGB2COL()
  {
    I=$(( $I + 1 ))
    _R=$(( $1 * 5 / 255 * 36 ))
    _G=$(( $2 * 5 / 255 * 6 ))
    _B=$(( $3 * 5 / 255 ))
    echo -n "\x1b[48;5;$(( 16 + $_R + $_G + $_B ))m  \x1b[0m"
    [[ 0 -eq $(( $I % $W )) ]] && echo -n '\n'
  }

  I=0

  echo $INF | while read line
  do
    RGB2COL `echo $line`
  done

else

  cat $@

fi

thx!

Thanks to your version I was able to update mine

I wanted to tell you that you're forgetting transparent colors and grayscale and that's a shame 😄
Anyways, thank you very much for your helpful version of catimg.