A very nice CartWeaver user contacted me for some help with her product images - basically, she wanted to add more images per product (easier than ever in CW3) and, most importantly, she wanted a way to let her clients upload a single image, and have the thumbnails and other sizes made automatically.
I added an automatic uploader / image resizer, and set up her images table in the CartWeaver database to handle 5 images for each product, with 4 sizes for tiny preview, details thumbnail, large image, and zoom.
In the CartWeaver admin, she simply uploads a single image file for each photo slot, and the thumbnails are made on the server (instead of a separate upload slot for each image size). Otherwise, it works and looks exactly like the regular CartWeaver admin.
On the display side, the single results page composes the mouseover image swap display for 1 to 5 mages, whatever is available.
The way this code works, any number of images and any number of sizes for each can be used - and any type of gallery, lightbox, list or display of the images can be populated from the image query.
Updated spring 2008: Now using CFimage for super fast, high quality resizing on the fly with more accurate height/width scaling.
The resizer works with both tall and wide images, with a maximum width and height set in the database for each size of image.
Each image upload slot can have its own set of sizes and max w/h dimensions, so the possibilities are almost endless.
The CW site I was working on was on a CF7 server, so instead of using the onboard CFimage functions in CF8, I went with Massimo Foti's tmt_img.cfc - so in theory it should work on any server, running any recent version of ColdFusion.
Contact me directly to log in and test the admin on that demo site, or if you are interested in using this code on your own CartWeaver (or other) sites.