catimg.sh
2432 bytes
1################################################################################
2# catimg script by Eduardo San Martin Morote aka Posva #
3# https://posva.net #
4# #
5# Output the content of an image to the stdout using the 256 colors of the #
6# terminal. #
7# GitHub: https://github.com/posva/catimg #
8################################################################################
9
10# this should come from outside, either `magick` or `convert`
11# from imagemagick v7 and ahead `convert` is deprecated
12: ${CONVERT_CMD:=convert}
13
14function help() {
15 echo "Usage catimg [-h] [-w width] [-c char] img"
16 echo "By default char is \" \" and w is the terminal width"
17}
18
19# VARIABLES
20COLOR_FILE=$(dirname $0)/colors.png
21CHAR=" "
22
23WIDTH=""
24IMG=""
25
26while getopts qw:c:h opt; do
27 case "$opt" in
28 w) WIDTH="$OPTARG" ;;
29 c) CHAR="$OPTARG" ;;
30 h) help; exit ;;
31 *) help ; exit 1;;
32 esac
33 done
34
35while [ "$1" ]; do
36 IMG="$1"
37 shift
38done
39
40if [ "$IMG" = "" -o ! -f "$IMG" ]; then
41 help
42 exit 1
43fi
44
45if [ ! "$WIDTH" ]; then
46 COLS=$(expr $(tput cols) "/" $(echo -n "$CHAR" | wc -c))
47else
48 COLS=$(expr $WIDTH "/" $(echo -n "$CHAR" | wc -c))
49fi
50WIDTH=$($CONVERT_CMD "$IMG" -print "%w\n" /dev/null)
51if [ "$WIDTH" -gt "$COLS" ]; then
52 WIDTH=$COLS
53fi
54
55REMAP=""
56if $CONVERT_CMD "$IMG" -resize $COLS\> +dither -remap $COLOR_FILE /dev/null ; then
57 REMAP="-remap $COLOR_FILE"
58else
59 echo "The version of convert is too old, don't expect good results :(" >&2
60 # $CONVERT_CMD "$IMG" -colors 256 PNG8:tmp.png
61 # IMG="tmp.png"
62fi
63
64# Display the image
65I=0
66$CONVERT_CMD "$IMG" -resize $COLS\> +dither `echo $REMAP` txt:- 2>/dev/null |
67sed -e 's/.*none.*/NO NO NO/g' -e '1d;s/^.*(\(.*\)[,)].*$/\1/g;y/,/ /' |
68while read R G B f; do
69 if [ ! "$R" = "NO" ]; then
70 if [ "$R" -eq "$G" -a "$G" -eq "$B" ]; then
71 ((
72 I++,
73 IDX = 232 + R * 23 / 255
74 ))
75 else
76 ((
77 I++,
78 IDX = 16
79 + R * 5 / 255 * 36
80 + G * 5 / 255 * 6
81 + B * 5 / 255
82 ))
83 fi
84 #echo "$R,$G,$B: $IDX"
85 echo -ne "\e[48;5;${IDX}m${CHAR}"
86 else
87 (( I++ ))
88 echo -ne "\e[0m${CHAR}"
89 fi
90 # New lines
91 (( $I % $WIDTH )) || echo -e "\e[0m"
92done