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

Question

I want to batch process images but I have a very specific task that I want to do

I do not want to change image type
I want to make them black and white
I want it to create/preserve images and sub folder structure

I did this in Photoshop but it did not preserve folders and sub folder content it just threw every converted file in one directory.

My only hope is Linux :D

Thank you in advance!

You can see different discussion about this here but Basharat Sial worked for me

http://ubuntuforums.org/showthread.php?t=2143992

And the images are in which format: RAW, TIFF, JPEG? Please edit your question with the information. — user68186, May 10 '13 at 20:02
@levan Convert images in place or create a new directory structure? — Basharat Sialvi, May 10 '13 at 21:16
Do not quite understand what you mean what I want is this for example main folder "F1" contains 4 different sub folders "2003" "2004" "2005" and "2006" and all of this sub folders Constantine 100-120 files so what I want is the new black and white files have the same structure as they where I do not care if it will overwrite or create a new folder all I care is them to be black and white and be in the same folders as they were for example if williams 2003.png was in "2003" I want the new file to be in "2003" as well — Levan, May 10 '13 at 21:21
http://askubuntu.com/questions/9868/convert-an-image-from-grayscale-to-binary || http://unix.stackexchange.com/questions/108613/how-do-you-binarize-a-colored-image — Ciro Santilli OurBigBook.com, Sep 25 '15 at 19:31

Basharat Sialvi · Accepted Answer · 2013-05-11T00:20:25.173

We can use convert command to convert images to black & white:

convert -colorspace GRAY image.png b-w_image.png

Where image.png is the input image and b-w_image.png is output imgage.

Combining this command with find we can create a bash one liner to convert all the images found under parent directory.

How-to:
Open terminal by hitting Ctrl+Alt+T, cd to parent/main directory and run the following command:

for img in $(find . -iname '*.png'); do echo -n "Converting $img"; convert -colorspace GRAY $img $img && echo ' [Done]'; done

It will convert and overwrite all the images under parent directory. I will suggest to test it on some temporary images and if you're satisfied with the results than run it on actual images.