Font Effects in 8-Bit and 24-Bit Colour Representations

Faki · 04-13-2023, 07:13 PM

I want to use 8-Bit and 24-Bit colours in terminal, and have seen some different versions.

Code:

code="\e[38;5;${if}m"
code="\e[38;5;${ir};${ig};${ib}m"

I am unsure about the second number 5, sometimes it is 2. Have read that it is also related to Font Effects.

Have also noticed that the Font Effect only affects the foreground and can be included separately (e.g. \e[5m). Is this correct ?

Code:

code="\e[5m\e[38;5;${ir};${ig};${ib}m"

teckk · 04-13-2023, 09:35 PM

Example:

Code:

green="\033[0;32m"
blue="\033[0;34m"
cyan="\033[0;36m"
red="\033[0;31m"
grey="\033[0;37m"
white="\033[1;37m"
bcyan="\033[1;36m"
bgreen="\033[1;32m"
bblue="\033[1;34m"
bred="\033[1;31m"
bgrey="\033[1;30m"
clr="\033[0m"

colors=($green $blue $cyan $red $grey $white $bcyan $bgreen $bblue $bred $bgrey $clr)

for i in "${colors[@]}" ;do
    printf "${i}Hello${clr} World\n"
done

Michael Uplawski · 04-14-2023, 03:54 AM

Bold: "\033[01m"
Underline: "\033[04m"

styled text: [style-code][text]\033[0m

It is unimportant if [text] is already colored. That is all I know. If – together with Teck's example – it is not sufficient, then I have not understood the OP and am ready to learn something.

Also, ... which style should possibly affect something else than the foreground?

teckk · 04-14-2023, 08:06 AM

Code:

#!/usr/bin/bash

#Playing with bash colors.

green="\033[0;32m"
blue="\033[0;34m"
cyan="\033[0;36m"
red="\033[0;31m"
grey="\033[0;37m"
white="\033[1;37m"
bcyan="\033[1;36m"
bgreen="\033[1;32m"
bblue="\033[1;34m"
bred="\033[1;31m"
bgrey="\033[1;30m"

colors=($green $blue $cyan $red $grey $white $bcyan $bgreen $bblue $bred $bgrey)

spacing=${1:-10} 
scroll=${1:-0}
screenlines=$(expr $(tput lines) - 1 + $scroll)
screencols=$(expr $(tput cols) / 2)

chars=(0 1)
count=${#chars[@]}
colorcount=${#colors[@]}

trap "tput sgr0; clear; exit" SIGTERM SIGINT

clear
tput cup 0 0
while :; do
    for ((i=1; i<=$screenlines; i++)); do
        for ((j=1; j<=$screencols; j++)); do
            rand=$(($RANDOM%$spacing))
            case $rand in
                0) printf "${colors[$RANDOM%$colorcount]}${chars[$RANDOM%$count]} " ;;
                1) printf "  " ;;
                *) printf "\033[2C" ;;
            esac
        done
        printf "\n"
    done
    printf "${colors[0]}Computing the exact value for pi, please wait."
    tput cup 0 0
    ran=".$((1 + RANDOM % 3))"
    sleep "$ran"
done