How can I batch convert images to b/w while preserving the folder structure

[Chelidze]

i updated my earlier post but i'll repeat myself
the code is a script, you need to save the code as a text file, just paste it into text editor and save
and then run the script
bash name_you_have_chosen
obviously change srcdir and destdir to suit your needs

now you most defensibly think I am an idiot but this is the first time I am using a script

if my folder that I want to convert is here

'/home/levan/Desktop/F1'

and

I want to out put it to here /home

what do I write

srcdir= I write '/home/levan/Desktop/F1' this ??

destdir= and here I will write this ~ ??

[Vaphell]

eg
srcdir=$HOME/Desktop/F1
destdir=$HOME/F1_grayscale
$HOME and ~ are pretty much the same fyi, i suggest adding something to dest ~ to contain results, because the script would get your main dir spammed otherwise (~ would be an equivalent of F1, which means untold amount of subdirs created right there)

[Chelidze]

eg
srcdir=$HOME/Desktop/F1
destdir=$HOME/F1_grayscale
$HOME and ~ are pretty much the same fyi, i suggest adding something to dest ~ to contain results, because the script would get your main dir spammed otherwise (~ would be an equivalent of F1, which means untold amount of subdirs created right there)

I wanted to do a test before I wold do the real deal so I run this commend and this is what I got

bash '/home/levan/Pictures/Wallpapers/test' /home/levan/Pictures/Wallpapers/test: line 13: unexpected EOF while looking for matching `"'
/home/levan/Pictures/Wallpapers/test: line 14: syntax error: unexpected end of file

this is what I wrote

srcdir=home/levan/Pictures/Wallpapers
destdir=home/levan/Pictures/Wallpapers/grayscale"

[Vaphell]

something is not right with the file, eg missing ) after -print0?
output of cat /home/levan/Pictures/Wallpapers/test ?

and don't put destination dir inside source to avoid feedback loop, you would risk converted files being found as input for another conversion depending on in what order find scans subdirs (1. find finds file X, grayscale version is created in dest subdir, 2. finds gets to discover dest subdir and scans it, 3. file X_grayscale is passed for another conversion but to dest/dest)
That might or might not happen if you run script once, but in case of repeating the script you would get another layer of dest each time (dest, dest/dest, dest/dest/dest, ...)

ok:
/home/levan/Pictures/Wallpapers
/home/levan/Pictures/Wallpapers_grayscale

ambiguous/feedback loop:
/home/levan/Pictures/Wallpapers
/home/levan/Pictures/Wallpapers/grayscale

[Chelidze]

something is not right with the file, eg missing ) after -print0?
output of cat /home/levan/Pictures/Wallpapers/test ?

and don't put destination dir inside source, you would risk converted files being found as input for conversion

ok:
/home/levan/Pictures/Wallpapers
/home/levan/Pictures/Wallpapers_grayscale
ambiguous:
/home/levan/Pictures/Wallpapers
/home/levan/Pictures/Wallpapers/grayscale

Wow it worked awesome

I had " things messed up

#!/bin/bash

# source and destination dirs
srcdir='/home/levan/Pictures/Wallpapers'
destdir='/home/levan/Pictures/Wallpapers/grayscale'


while read -rd $'\0' f
do
  echo "$f"
  fdir=${f%/*}
  mkdir -p "${fdir/#$srcdir/$destdir}"
  convert "$f" -set colorspace Gray -separate -average "${f/#$srcdir/$destdir}"
done < <( find "$srcdir" -regextype posix-extended -iregex '.*(png|bmp|jpe?g|tga|gif|tiff)$' -print0 )

did this and it worked awesome

thank you now I know -ish how to work with bash files

thanks to you thank you again

[Vaphell]

really put the dest outside src, if you would run the script again you would get Wallpapers/grayscale/grayscale (original grayscale is treated as an input and gets its own subdir in itself), another run another layer

[Chelidze]

really put the dest outside src, if you would run the script again you would get Wallpapers/grayscale/grayscale (original grayscale is treated as an input and gets its own subdir in itself), another run another layer

ooo ok thanks again