How to get path of primary image within selected product color choice?

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How to get path of primary image within selected product color choice?
For instance, I currently use the cover image, which I get the file path as follows.
{$link->getImageLink($product->link_rewrite, $cover.id_image, 'large')}
I do this to display the cover image if an attribute combination has no photo/product suggestion.
I want to be able to show the plain attribute phot for the particular selected photo.

I know it's the image first shown when a color is selected from the color selector, but can't seem to get the code line equivalent to $cover.id_image specific to color.
Thanks!

[luci1]

Hi,

 

I'm also interested by this solution have you find one ?