Re: still blue

[Greg Wooledge <greg@wooledge.org>]

On Mon, Jul 25, 2022 at 01:17:38PM +0200, Thomas Schmitt wrote:
> #!/bin/bash

>   rhex="$(printf '%2.2x' "$r")"

As of bash 3.1, you can use   printf -v rhex %2.2x "$r"

>     ghex="$(printf '%2.2x' "$g")"

Same.

>     bstart="$(expr "(" "$r" + "$g" ")" / 2 + "$blue_advantage")"

bstart=$(( (r+g)/2 + blue_advantage ))

>     if test "$bstart" -lt "$blue_base"

Not wrong, but you could also use    if ((bstart < blue_base))

>       for b in $(eval echo $(echo '{'"$bstart"..255..8'}'))

for ((b=bstart; b<=255; b+=8))

>         bhex="$(printf '%2.2x' "$b")"
>         echo "#${rhex}${ghex}${bhex}"

Oh, is this what the *hex variables are for?  Why not just leave them
in pseudo-integer form the whole time, and then use a single printf *here*
to convert them to hex for output?

printf '#%2.2x%2.2x%2.2x\n' "$r" "$g" "$b"