Best way to deal with image thumbnails on news web site (CMS)?

[eluser]Markc[/eluser]
[quote author="jojo777" date="1352554159"]Hi Markc I'll try to explain how I did that is past. I was working in a web with a news section, with a main image and its own gallery.

It worked like this:
- The user(admin or the owner) create the article and uploaded the images, then the code automatically saves the image and creates its thumbnail in a folder.

I'm sure you know how the CI upload class works, its easy to use, and normally its good to generate a random name for the image and the thumbnail.

You can also try the blueimp multiupload images with jquery that really worked for me very good!

Look the demo:
https://github.com/blueimp/jQuery-File-Upload
Here you have the wiki wich contains info about how to implement with codeigniter
https://github.com/blueimp/jQuery-File-Upload/wiki

Hope it helps you [/quote]

Thanks for your answer, but it's not exactly what I asked.

In short I was asking is it better practice to generate the thumbnails on the fly, or to save them as they are uploaded?

Anyway the jQuery library that you suggested is really nice working, I will use it for my other project, I was looking for exactly the same style of multiple upload images.