Reply To: Product swatches on shop page

I understand the concept but when you have different images for each size-color variation, for example:
– t-shirt in size S color white
– t-shirt in size L color white
– t-shirt in size S color black
– t-shirt in size L color black

From which variation image will be shown in swatches? In example, in the shop grid there will be two color swatches: black and white. Do white swatches take images from S or L (images for each size be different)? Do black swatches take images from S or L (images for each size be different)? We have two possibilities.