Add imagemagick tutorial

README.org

@@ -42,7 +42,10 @@ opportunity to learn about computers, files, directories and programs.
  * [[./tutorial/pacman.org][Use package manager in Parabola GNU-linux: verify packages in cache]]
  * [[./tutorial/removing_packages.org][Removing packages in Parabola GNU-Linux]]
 
-   
+** Work with images
+
+ * [[./tutorial/image_size_reduction.org][Reduce image quality and size from terminal]]
+ 
 ** Disk space utilization and manipulation
 
  * [[./tutorial/ncdu.org][Exploring disk space with 'ncdu']]

tutorial/image_size_reduction.org

@@ -0,0 +1,70 @@
+#+date: 2023-08-20
+#+options: toc:nil num:nil author:nil
+
+* Use imagemagick to manipulate images
+
+
+Converting multiple ~jpg~ files into lower size images:
+
+#+begin_example sh
+  convert '*.jpg' -set filename:fn '%[basename]-small' -resize 960x640 '%[filename:fn].jpg'
+#+end_example
+
+convert <INPUT_FILE> -quality 10% <OUTPUT_FILE>
+
+#+begin_example sh
+  convert '*.jpg' -set filename:fn '%[basename]-small' -quality 50%  '%[filename:fn].jpg'
+#+end_example
+
+** Using mogrify
+
+Counting number of ~.jpg~ images in a directory:
+
+#+begin_example sh
+  ls -1U DIR_NAME | wc -l
+#+end_example
+
+Output:
+
+75 
+
+Verifying the images weight:
+
+#+begin_example sh
+  du -h
+#+end_example
+
+Output:
+
+306 M
+
+Resize all the ~.jpg~ images within the directory:
+
+#+begin_example sh
+ mogrify -resize 960x640 *.jpg
+#+end_example
+
+Output:
+
+42M
+
+#+begin_example sh
+  mogrify -quality 80% *.jpg
+#+end_example
+
+Weight:
+
+#+begin_example sh
+  du -h
+#+end_example
+
+Output:
+
+12M
+
+** References
+
+- [[https://askubuntu.com/questions/1354205/imagemagick-convert-on-a-multiple-files][Imagemagick to convert multiple files]]
+- [[https://imagemagick.org/][Imagemagick web site]]
+- [[https://www.digitalocean.com/community/tutorials/reduce-file-size-of-images-linux][Digital ocean tutorial]]
+