Resizing images / creating smaller product thumbnail images

[yvan]

I'd like to modify the auction app so that a second, smaller thumbnail image is generated (and saved on the server) using the uploaded image.

I already know how to resize images and generate thumbnail images using PHP. But which file would I need to modify in order to add this functionality, .. and how do I go about it? Please advise.

Thanks!
- Yvan

[shannah]

There are many strategies to do this. If you are automatically generating these thumbnails, you could just use naming conventions for the thumbnails so that you don't have to store any additional information in the database, and just modify the templates to show the thumbnail.

The public_product_list.html template is used for the list view.
The view_product.html template is used to show the product details.

[yvan]

But which file(s) would I need to modify within the application in order to add this type of functionality (ie: code that generates a separate thumbnail image) ?