Search and cart is used to, probably there for historical purposes now, you could also use the thumbnails in marketing lists instead of resized images. Largely unused on most sites and always has been IME.
When I am preparing an image, I make 3 sizes of it: thumbnail, standard and large. I am guessing that the thumbnail is used if opting for thumbnails in the Checkout. It could also be used as an image for a Section, appearing alongside the title. The standard image I used for the product for its section listing and its separate page, and the large image for the Extended Info Page.
Creating the images yourself rather than an automatic resizing should result in a better quality image. I usually go back to the original when doing each size, as reducing a reduced image leads to poorer quality than reducing from a large image.
I don't know about "going sizes", but I make my thumbnail max measurement (whether width or height) 100 pixels, standard image 200 pixels, and large image 300 pixels.
If it helps, I've standardised on 320x320px for SPP layout & 160x160px for thumbnails. By dropping the quality of thumbnails down to 90%, the size of the physical file goes down from 30-40k to about 10-12k each.
My Actinic now runs on a mac book, so the two apps that I use to resize & rename all images are RESIZE! and NameChanger respectively.Both I found very easy to use. Before this, on Windows, I use to use Pixsizer whose Bach facility is very good if you have many images to resize.
HTH,
Nilesh
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