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Product image cache

Product image cache

Hi
I think I'm missing some thing here.
Ive uploaded my product images as 350 x 400 and they show on the frontend. Only 1 product image per product. for base small and thumb.

now my product image setting in admin are
Small Image Width 300 
Small image Height 300
Large Image Width 350 ( Im assuming this is a base image)
Large Image Height 400 ( Im assuming this is a base image)

 

This is going to sound a stupid question, do i upload separate images for base, small, thumbnail. With the sizes above.
The reason why i ask is i have optimized my product images, but when i check the pagespeed, the product images need optimizing, (they are being created in the cache but the images in question are 400x400.
So i dont really understand how to keep my images optimized at the right size image. If that makes sense.