CMYK Conversion

[kyndder]

First of all, congratulations for this great tool!

Because of a very specific case, I needed to convert about 6000 colors using its CIELab values, to its corresponding CMYK values and, with this values, feed a color library of a specific application used by print purposes.

As that library is used only for color representation on screen and, being CMYK the only color space interpreted by the application, pastel helped me a lot to achieve my need.

Using pastel + a simple script I made to help me on the bulk conversion, in only one day I was able to make a job that could had took many days, using any other workaround.

Here's the script;

#!/bin/bash

c=""
m=""
y=""
k=""
re='^[0-9]+$'
r=""
g=""
b=""

read r g b
biggest=$r
if [ $g -gt $biggest ]
then
    biggest=$g

    if [ $b -gt $biggest ]
    then
        biggest=$b
    fi
fi

calc()
{
key=`echo "scale=4;(1-($biggest/255))"|bc -l` 
cyan=`echo "scale=4;((1-($r/255)-$key)/(1-$key))"|bc -l`
magenta=`echo "scale=4;((1-($g/255)-$key)/(1-$key))"|bc -l`
yellow=`echo "scale=4;((1-($b/255)-$key)/(1-$key))"|bc -l`

k=`echo "($key*100)" | bc -l | awk '{printf "%.0f\n", $0}'`
c=`echo "($cyan*100)" | bc -l | awk '{printf "%.0f\n", $0}'`
m=`echo "($magenta*100)" | bc -l | awk '{printf "%.0f\n", $0}'`
y=`echo "($yellow*100)" | bc -l | awk '{printf "%.0f\n", $0}'`
} 2> /dev/null

calc

if ! [[ $c =~ $re ]] ; then
   c=0
fi

if ! [[ $m =~ $re ]] ; then
   m=0
fi

if ! [[ $y =~ $re ]] ; then
   y=0
fi

output="cmyk($c $m $y $k)"

if command -v pastel > /dev/null 2>&1 ; then
    fg="$(pastel textcolor "rgb($r,$g,$b)")"
    pastel paint "$fg" --on "rgb($r,$g,$b)" "$output"
else
    echo "$output"
fi

And here, a sample output;

It would be great if some day we have native CMYK convertion in pastel.

Thanks!

[sharkdp]

First of all, congratulations for this great tool!

Thank you for the feedback!

Using pastel + a simple script I made to help me on the bulk conversion, in only one day I was able to make a job that could had took many days, using any other workaround.

:+1:

It would be great if some day we have native CMYK convertion in pastel.

Let's discuss this in the PR by @aeter: #123

[kyndder]

Thank you for the feedback!

You're welcome!

Let's discuss this in the PR by @aeter: #123

Ok! Thanks!

I'll close this issue...