HI I have the same question the best size for the collection image so that is either to small or to big in the homepage, I'm new here and still working on my store any suggestions? Hee my store https://jctshirts.com/
Jumping in late but in case anyone else happens along when doing a Google search ... I am finding that a little bit of playing around (size one, try it, see how it looks) is best for determining image size. I just created an image that was 2400 x 300 and it worked perfectly (after trying several that cut off inappropriately
As much as I know, there's no specific size, and they can be pretty big, around 4000px, or even bigger. I don't really use images that are so big and I like better smaller ones because it's easier to work with them. I usually use imglarger to resize them or to change the resolution and I've been doing this for a while. Usually, I do update my collection photos with new dimensions every once in a while, depending on what I need and what I'm gonna do, but 1200X400, and 2048x600 are my go-to sizes.
Do you have the dimensions of what part of the 2400px X 2400px is seen when viewing the collection? I understand the image cover displays as a square on the home page, but when the collection is selected, it shows a lower res. cropped version of that original 2400x2400. I am looking for some sort of template that shows me what will be in view when displayed as a banner at the top of each collection.
I hope that makes sense.
All my best,