Batch resize images and output images to new folder with ImageMagick

Question

Current image folder path:

public_html/images/thumbs

Output image folder path:

public_html/images/new-thumbs

I have 10 video thumbs per video in current folder, named of image thumbs:

1-1.jpg
1-2.jpg
1-3.jpg
1-4.jpg
1-5.jpg (Resize)
1-6.jpg
1-7.jpg
1-8.jpg
1-9.jpg
1-10.jpg

2-1.jpg
2-2.jpg
2-3.jpg
2-4.jpg
2-5.jpg (Resize)
2-6.jpg
2-7.jpg
2-8.jpg
2-9.jpg
2-10.jpg

I want to resize all 5th images(*-5.jpg) to the new folder. I've tried below command but no luck:

mogrify 
-path 
  public_html/images/thumbs/*-5.jpg 
-resize 16×12 
-quality 100 
  public_html/images/new-thumbs/*-5.jpg

Answer 1

"Mogrify" should be called from the directory with the original thumbnails, while the -path parameter is for pointing target directory.

cd public_html/images/thumbs
magick mogrify -resize 16x12 -quality 100 -path ../new-thumbs *.jpg

http://www.imagemagick.org/Usage/basics/#mogrify

the last arguments are the list of files, so you can filter by name pp*.jpg for example.

Answer 2

Suggested solutions do not work properly on the latest ImageMagick (at least, on macOS). Command, that works overwriting source images is as follows:

magick mogrify -path ./ -resize 50% -quality 80 *.jpg

To avoid overwriting the original images, write to a new folder:

magick mogrify -path path/to/destination/folder/ -resize 50% -quality 80 *.jpg

Answer 3

In ImageMagick 7 versions its built into the magick ...so..

magick mogrify -resize 16x12 -quality 100 -path ../new-thumbs *.jpg

Make sure that the folder you specify in path exists. It will not be created by ImageMagick.

Find more information here https://www.imagemagick.org/script/mogrify.php

Answer 4

For those having Shotwell installed on Ubuntu/Debian, following may be more easy to export selected images in a folder to another folder through processing the images as needed.

• Open Shotwell
• Select the images you want to export
• File > Export
• Adjust the values to your needs
• Select the folder to export