Fred's ImageMagick Scripts: COLORCONVERTER

Fred's ImageMagick Scripts

COLORCONVERTER

Generates a spectrum-like image from the colors in an image

last modified: October 01, 2009

USAGE: colorconverter -c "color" [-d dimensions] [-s] [-v]
USAGE: colorconverter [-h or -help]

-c .... color ......... Any valid IM color specification
-d .... dimensions .... Dimensions of optional color swatch; WidthxHeight;
-s .................... Show color swatch of specified color
-v .................... Validate all converted colors by showing color swatches

PURPOSE: To convert any valid ImageMagick color specification to the other ImageMagick color representations.

DESCRIPTION: COLORCONVERTER converts any valid ImageMagick color specification to other ImageMagick color representations, including: RGB, HEX, HSL, HSB and CMYK. The values will be listed to the Terminal. A color swatch for the input color may be displayed. Also a swatch for each of the other color representations may be displayed.

ARGUMENTS:

-c color ... COLOR is any valid IM color specification, including RGB, HEX, HSL, HSB, CMYK or by name. If not a color name, the color specification should be enclosed in quotes.

-d dimensions ... DIMENSIONS specifies the WidthxHeight for the color swatch(es). The default="150x150".

-s ... Indicates to display a color swatch for the specified color.

-v ... Indicates to display a color swatch for each converted color in the various color representations.

NOTE: Prior to IM 6.5.6-6, HSL colors may not produce correct swatches, as changes and bugs were fixed starting with IM 6.5.6-4. Prior to IM 6.5.6-4, HSL colors were specified only with hue in range 0-360 and saturation and lightness as percentages. HSB color specification and swatches were only first available and correct starting with IM 6.5.6-6.

CAVEAT: No guarantee that this script will work on all platforms, nor that trapping of inconsistent parameters is complete and foolproof. Use At Your Own Risk.

EXAMPLES (IM 6.5.6-6)

Text Output	Color Swatch
colorconverter -c wheat -s RGB: rgb(245,222,179) rgb(96.0784%,87.0588%,70.1961%) HEX: #F5F5DEDEB3B3 HSL: hsl(39.09,195.696,212) hsl(10.8583%,76.7437%,83.1373%) HSB: hsb(39.09,68.6926,245) hsb(10.8583%,26.9383%,96.0784%) CMYK: cmyk(0,23.9377,68.6926,10) cmyk(0%,9.38735%,26.9383%,3.92157%)

Text Output	Color Swatch
colorconverter -c "rgb(0,0,255)" -s RGB: rgb(0,0,255) rgb(0%,0%,100%) HEX: #00000000FFFF HSL: hsl(240,255,127.502) hsl(66.6667%,100%,50.0008%) HSB: hsb(240,255,255) hsb(66.6667%,100%,100%) CMYK: cmyk(255,255,0,0) cmyk(100%,100%,0%,0%)

Text Output	Color Swatch
colorconverter -c "#FFFF00" -s RGB: rgb(255,255,0) rgb(100%,100%,0%) HEX: #FFFFFFFF0000 HSL: hsl(59.9973,255,127.502) hsl(16.6659%,100%,50.0008%) HSB: hsb(60.0027,255,255) hsb(16.6674%,100%,100%) CMYK: cmyk(0,0,255,0) cmyk(0%,0%,100%,0%)

Text Output	Color Swatch
colorconverter -c "hsl(120,255,127.5)" -s RGB: rgb(0,255,0) rgb(0%,100%,0%) HEX: #0000FFFF0000 HSL: hsl(120,255,127.502) hsl(33.3333%,100%,50.0008%) HSB: hsb(120,255,255) hsb(33.3333%,100%,100%) CMYK: cmyk(255,0,255,0) cmyk(100%,0%,100%,0%)

Text Output	Color Swatch
colorconverter -c "hsb(83.3341%,100%,100%)" -s RGB: rgb(255,0,254.988) rgb(100%,0%,99.9954%) HEX: #FFFF0000FFFC HSL: hsl(300.003,255,127.502) hsl(83.3341%,100%,50.0008%) HSB: hsb(300.003,255,255) hsb(83.3341%,100%,100%) CMYK: cmyk(0,255,0.0116732,0) cmyk(0%,100%,0.00457771%,0%)

Text Output	Color Swatch
colorconverter -c "cmyk(255,0,0,0)" -s RGB: rgb(0,255,255) rgb(0%,100%,100%) HEX: #0000FFFFFFFF HSL: hsl(179.997,255,127.502) hsl(49.9992%,100%,50.0008%) HSB: hsb(180.003,255,255) hsb(50.0008%,100%,100%) CMYK: cmyk(255,0,0,0) cmyk(100%,0%,0%,0%)

What the script does is as follows:

Converts the color to each colorspace: RGB, HSL, HSB, CMYK
Extracts the raw component values for the IM Q level
Converts each component to range 0-255, 0-360 and range 0-100%
as appropriate
Prints the colorspace values in the appropriate format
Optionally creates and displays a color swatch for the specifice color

This is equivalent to the following IM commands for the RGB components.

rgb=`convert xc:"$color" -colorspace RGB txt:- |\
tail -n 1 |\
sed -n 's/ *//g; s/^.*[:][(]$.*$[)].*[\#].*$/\1/p'`
RR=`echo "$rgb" | cut -d, -f1`
GG=`echo "$rgb" | cut -d, -f2`
BB=`echo "$rgb" | cut -d, -f3`
AA=`echo "$rgb" | cut -d, -f4`
RRV=`convert xc: -format "%[fx:255*$RR/quantumrange]" info:`
GGV=`convert xc: -format "%[fx:255*$GG/quantumrange]" info:`
BBV=`convert xc: -format "%[fx:255*$BB/quantumrange]" info:`
RRP=`convert xc: -format "%[fx:100*$RR/quantumrange]" info:`
GGP=`convert xc: -format "%[fx:100*$GG/quantumrange]" info:`
BBP=`convert xc: -format "%[fx:100*$BB/quantumrange]" info:`
[ "$AA" != "" ] && AAV=`convert xc: -format "%[fx:$AA/quantumrange]" info:`
if [ "$AA" = "" ]; then
echo "rgb($RRV,$GGV,$BBV)"
echo "rgb($RRP%,$GGP%,$BBP%)"
else
echo "rgba($RR,$GG,$BB,$AAV)"
echo "rgba($RRP%,$GGP%,$BBP%,$AAV)"
fi
if [ "$show" = "yes" ]; then
convert -respect-parenthesis $ -size "$dimensions" xc:"$color" $ \
-colorspace rgb -background white -fill black -font Helvetica \
-pointsize 10 label:"$color" -gravity south -append -alpha off show:
fi