Michael Yaeger wrote: We've added watermarks to all images in the site and replaced them on the server. However, K2 items do not display the updated images. Is running the above mentioned script required?

OK, I was able to run the script, but it simply took the images in the `src` directory and rebuilt them in the `cache` directory, which was not what I needed. My images were in the same location as when I uploaded them (Joomla! `images` directory). I was able to use this extension (K2 Import) to rewrite all the images by exporting the K2 database and importing it, again, since the extension gives you the option to choose the image source directory:
www.individual-it.net/en/Joomla/View-category.html

However, I still need a solution to rebuild the category images. It seems K2 discards the original image file location and rewrites all the images in the database and on the server with the category ID as the filename. That means all the information about the original file is LOST!

So, how can I rebuild all K2 category images from the original files in the Joomla! images folder?

Unfortunately you will have to manually reupload these images.

Krikor wrote: Unfortunately you will have to manually reupload these images.

I don't believe manually going into 481 categories in the K2 admin to upload images is a recommended task.

I am sorry but this task is not included in that extension.
You can use an automation tool like Grunt if you want to downsize your images, if you are looking to decrease the size.

Hello
I used the script with a J! 3.8.1/K2 2.8.0 site to resize the cached images. It worked to recreate the cache, but now I don't see the items main images anymore. If I open every item, no image is available in image tab. Maybe because the script used a different name for the cached files?

Are you getting any 403/404 errors in your console?

Krikor wrote: Are you getting any 403/404 errors in your console?

Yes, but for:
fontawesome-webfont.ttf Failed to load resource: the server responded with a status of 404 (Not Found)

Do you have any backups to compare the filenames?

Hi Krikor
looking at the backup copy I see that the script ha created only a few files, into the cache there are 876 files, into the K2 media items one there are just some dozen.