在 UNIX shell 脚本中将十六进制颜色转换为十进制 RGB 值

发布于 2024-12-02 17:50:23 字数 143 浏览 1 评论 0原文

我确信有人已经解决了这个问题：有什么简单且便携的方法可以将十六进制颜色值（从 000000 到 FFFFFF 的任何值）转换为 0 到 255 之间的 3 个十进制值。（如果您不熟悉颜色如何转换）传统上用 HTML 表示，前两个十六进制数字是第一个十进制数字，依此类推。）

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只为一人 2024-12-09 17:50:23

$ cat hexrgb.sh
#!/bin/bash
hex="11001A"
printf "%d %d %d\n" 0x${hex:0:2} 0x${hex:2:2} 0x${hex:4:2}

$ ./hexrgb.sh
17 0 26

如果您不愿意使用 bash 进行子字符串扩展，我仍然会使用 printf 进行转换。

$ cat hexrgb.sh
#!/bin/bash
hex="11001A"
printf "%d %d %d\n" 0x${hex:0:2} 0x${hex:2:2} 0x${hex:4:2}

$ ./hexrgb.sh
17 0 26

If you are not willing to use bash for substring expansion, I'd still use printf for the conversion.

回复收藏 0 原文

天邊彩虹 2024-12-09 17:50:23

您可以使用像这样的脚本：

#!/bin/sh
# hextorgb.sh
hexinput=`echo $1 | tr '[:lower:]' '[:upper:]'`  # uppercase-ing
a=`echo $hexinput | cut -c-2`
b=`echo $hexinput | cut -c3-4`
c=`echo $hexinput | cut -c5-6`

r=`echo "ibase=16; $a" | bc`
g=`echo "ibase=16; $b" | bc`
b=`echo "ibase=16; $c" | bc`

echo $r $g $b
exit 0

并像这样使用它：

./hextorgb.sh "11001A"

产生像这样的输出：

17 0 26

它可以通过测试参数等来改进，但它可以满足您的要求。

You can use a script like:

#!/bin/sh
# hextorgb.sh
hexinput=`echo $1 | tr '[:lower:]' '[:upper:]'`  # uppercase-ing
a=`echo $hexinput | cut -c-2`
b=`echo $hexinput | cut -c3-4`
c=`echo $hexinput | cut -c5-6`

r=`echo "ibase=16; $a" | bc`
g=`echo "ibase=16; $b" | bc`
b=`echo "ibase=16; $c" | bc`

echo $r $g $b
exit 0

and use it like:

./hextorgb.sh "11001A"

resulting in output like:

17 0 26

It can be improved by testing for arguments and so on, but it does what you want.

回复收藏 0 原文

回忆凄美了谁 2024-12-09 17:50:23

如果您需要此脚本的 POSIX 兼容版本来处理更有效的 CSS 十六进制颜色格式（即：带 alpha 通道的 4 部分 #AABBCCDD、3 字符快捷方式 #FFF），这应该可以解决问题：

#!/bin/sh
##? ~/bin/hex2rgb - convert color hex to rgb
# '#C0FFEE' => 192 255 238
# 'DEADBEEF' => 222 173 190 239
# 'fab' => 255 170 187
__hex2rgb() {
  # reset $1 to scrubbed hex: '#01efa9' becomes '01EFA9'
  set -- "$(echo "$1" | tr -d '#' | tr '[:lower:]' '[:upper:]')"
  START=0
  STR=
  while (( START < ${#1} )); do
    # double each char under len 6 : FAB => FFAABB
    if (( ${#1} < 6 )); then
      STR="$(printf "${1:${START}:1}%.0s" 1 2)"
      (( START += 1 ))
    else
      STR="${1:${START}:2}"
      (( START += 2 ))
    fi
    echo "ibase=16; ${STR}" | bc
  done
  unset START STR
}
__hex2rgb "$@"

If you need a POSIX compatible version of this script that handles more valid CSS hex color formats (ie: 4-part with alpha channel #AABBCCDD, 3 char shortcuts #FFF), this should do the trick:

#!/bin/sh
##? ~/bin/hex2rgb - convert color hex to rgb
# '#C0FFEE' => 192 255 238
# 'DEADBEEF' => 222 173 190 239
# 'fab' => 255 170 187
__hex2rgb() {
  # reset $1 to scrubbed hex: '#01efa9' becomes '01EFA9'
  set -- "$(echo "$1" | tr -d '#' | tr '[:lower:]' '[:upper:]')"
  START=0
  STR=
  while (( START < ${#1} )); do
    # double each char under len 6 : FAB => FFAABB
    if (( ${#1} < 6 )); then
      STR="$(printf "${1:${START}:1}%.0s" 1 2)"
      (( START += 1 ))
    else
      STR="${1:${START}:2}"
      (( START += 2 ))
    fi
    echo "ibase=16; ${STR}" | bc
  done
  unset START STR
}
__hex2rgb "$@"

回复收藏 0 原文

尘曦 2024-12-09 17:50:23

#!/usr/bin/env bash

hex2rgb() {
    hex=$(echo "${1^^}" | sed 's/#//g')

    a=$(echo $hex | cut -c-2)
    b=$(echo $hex | cut -c3-4)
    c=$(echo $hex | cut -c5-6)

    r=$(echo "ibase=16; $a" | bc)
    g=$(echo "ibase=16; $b" | bc)
    b=$(echo "ibase=16; $c" | bc)

    echo ${1^^}
    echo $r $g $b
}

hex2rgb "#FF0000"
hex2rgb "#00FF00"
hex2rgb "#0000FF"

#!/usr/bin/env bash

hex2rgb() {
    hex=$(echo "${1^^}" | sed 's/#//g')

    a=$(echo $hex | cut -c-2)
    b=$(echo $hex | cut -c3-4)
    c=$(echo $hex | cut -c5-6)

    r=$(echo "ibase=16; $a" | bc)
    g=$(echo "ibase=16; $b" | bc)
    b=$(echo "ibase=16; $c" | bc)

    echo ${1^^}
    echo $r $g $b
}

hex2rgb "#FF0000"
hex2rgb "#00FF00"
hex2rgb "#0000FF"

回复收藏 0 原文

残疾 2024-12-09 17:50:23

我知道这个问题已经很老了，但添加一个轶事；

或者，如果您想将 RGB 转换为十六进制，您可以执行以下操作：

#!/bin/sh
# rgbtohex.sh
f="$1,"
focus=0
start=0
until [ "$limit" == "3" ]
  do
    focus=$((focus+1))
    if [ "${f:$focus:1}" == "," ]
    then
        limit=$((limit+1))
        length=$(($focus-$start))
        let c$limit="${f:start:length}"
        start=$((focus+1))
    fi
done
r=`echo "obase=16; $c1" | bc`
r2=`echo "obase=16; $c2" | bc`
r3=`echo "obase=16; $c3" | bc`
if [ "${r:1:2}" == "" ]
  then r=0$r
fi
if [ "${r2:1:2}" == "" ]
  then r2=0$r2
fi
if [ "${r3:1:2}" == "" ]
  then r3=0$r3
fi
echo $r$r2$r3

I know this question is quite old but to add an anecdote;

alternatively, if you wanted to convert rgb to hex you could do a little something like:

#!/bin/sh
# rgbtohex.sh
f="$1,"
focus=0
start=0
until [ "$limit" == "3" ]
  do
    focus=$((focus+1))
    if [ "${f:$focus:1}" == "," ]
    then
        limit=$((limit+1))
        length=$(($focus-$start))
        let c$limit="${f:start:length}"
        start=$((focus+1))
    fi
done
r=`echo "obase=16; $c1" | bc`
r2=`echo "obase=16; $c2" | bc`
r3=`echo "obase=16; $c3" | bc`
if [ "${r:1:2}" == "" ]
  then r=0$r
fi
if [ "${r2:1:2}" == "" ]
  then r2=0$r2
fi
if [ "${r3:1:2}" == "" ]
  then r3=0$r3
fi
echo $r$r2$r3

回复收藏 0 原文

瑾夏年华 2024-12-09 17:50:23

The simplest, but not compact, way to convert a color value is to 
use the constant = ("1.00, 255 FF" "..., .. .." "0.0, 0 00").
The  example in the last line of the script converts the string 
to a hexadecimal color value from the file /usr/share/X11/rgb.txt. 
Using the search command grep -A in the case of rgb 0.00.

#!/usr/bin/env bash
# rgb; X11; hex; --> HEX.
# ${BASH} ./rgb-hex.sh or "{ 0.0, 0.0, 0.0 }"; or "magenta"; or #ffffff
# Otherwise, a value of the type "#000" will be returned, as well as "empty" or "error".
# В іншому випадку буде повернуто значення типу "#000", а також "порожнє" або "помилка".

NO_ARGS=0
E_OPTERROR=65

if [ $# -eq "$NO_ARGS" ]  # Script called without arguments?
then
  echo "Directions for use: `basename $0` options \"{ 0.0, 0.0, 0.0 }\""
  exit $E_OPTERROR      # If there are no arguments, exit with a message
fi

rgbinhex (){

IN="${1:-{ 0.0, 0.0, 0.0 }}"

printf -v IN "${IN//[\{\ \}]/}0"
   IN="${IN//[,]/0,}"
   IN="$( grep -Eo '[1]*\.[0-9]{,2}' \
   <<<"${IN}" | tr -d \. | sed 's/^0//g;'       )"

printf -v R "$( head -n1 <<<"${IN}" | tail -n1  )"

printf -v G "$( head -n2 <<<"${IN}" | tail -n1  )"

printf -v B "$( head -n3 <<<"${IN}" | tail -n1  )"


printf '\x23%02X%02X%02X\n' "$(( R * 255 / 100 ))" \
     "$(( G * 255 / 100 ))" "$(( B * 255 / 100 ))"

}


[[ ${1} = \{*\,* ]] && rgbinhex "${1}" \
  && \
      exit 0

[[ ${1} = \#[[:xdigit:]]* ]] && printf '%s\n' "${1}" \
    | tr '[:lower:]' '[:upper:]' \
  && \
      exit 0

[[ ${1} = "" ]] && printf '%s\n' "#000" \
  && \
      exit 0

[[ ${1} = [[:alnum:]\ ]* ]] && printf '#%02X%02X%02X\n' \
   $(grep -Eiwm1 "\s\s*${1}quot; "/usr/share/X11/rgb.txt"  \
    | awk '{print $1,$2,$3}') \
  && \
      exit 0


exit 0

For checking and control you can use the wonderful GUI script nf yad:
~$ yad --window-icon=color-selection --title=Color-Selection --color --gtk-palette --expand-palette --palette=/usr/share/X11/rgb.txt --scroll

The simplest, but not compact, way to convert a color value is to 
use the constant = ("1.00, 255 FF" "..., .. .." "0.0, 0 00").
The  example in the last line of the script converts the string 
to a hexadecimal color value from the file /usr/share/X11/rgb.txt. 
Using the search command grep -A in the case of rgb 0.00.

#!/usr/bin/env bash
# rgb; X11; hex; --> HEX.
# ${BASH} ./rgb-hex.sh or "{ 0.0, 0.0, 0.0 }"; or "magenta"; or #ffffff
# Otherwise, a value of the type "#000" will be returned, as well as "empty" or "error".
# В іншому випадку буде повернуто значення типу "#000", а також "порожнє" або "помилка".

NO_ARGS=0
E_OPTERROR=65

if [ $# -eq "$NO_ARGS" ]  # Script called without arguments?
then
  echo "Directions for use: `basename $0` options \"{ 0.0, 0.0, 0.0 }\""
  exit $E_OPTERROR      # If there are no arguments, exit with a message
fi

rgbinhex (){

IN="${1:-{ 0.0, 0.0, 0.0 }}"

printf -v IN "${IN//[\{\ \}]/}0"
   IN="${IN//[,]/0,}"
   IN="$( grep -Eo '[1]*\.[0-9]{,2}' \
   <<<"${IN}" | tr -d \. | sed 's/^0//g;'       )"

printf -v R "$( head -n1 <<<"${IN}" | tail -n1  )"

printf -v G "$( head -n2 <<<"${IN}" | tail -n1  )"

printf -v B "$( head -n3 <<<"${IN}" | tail -n1  )"


printf '\x23%02X%02X%02X\n' "$(( R * 255 / 100 ))" \
     "$(( G * 255 / 100 ))" "$(( B * 255 / 100 ))"

}


[[ ${1} = \{*\,* ]] && rgbinhex "${1}" \
  && \
      exit 0

[[ ${1} = \#[[:xdigit:]]* ]] && printf '%s\n' "${1}" \
    | tr '[:lower:]' '[:upper:]' \
  && \
      exit 0

[[ ${1} = "" ]] && printf '%s\n' "#000" \
  && \
      exit 0

[[ ${1} = [[:alnum:]\ ]* ]] && printf '#%02X%02X%02X\n' \
   $(grep -Eiwm1 "\s\s*${1}quot; "/usr/share/X11/rgb.txt"  \
    | awk '{print $1,$2,$3}') \
  && \
      exit 0


exit 0

For checking and control you can use the wonderful GUI script nf yad:
~$ yad --window-icon=color-selection --title=Color-Selection --color --gtk-palette --expand-palette --palette=/usr/share/X11/rgb.txt --scroll

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