Associating alternate images with specific matrix subitem

I am attempting to determine which subset of the alternate images defined for a matrix item are associated with a specific matrix property, e.g. all of the Red images where Red is a value in the Color ItemOptions for the InventoryItem.  When using SuiteTalk to retrieve the details for the item, the alternate image data is contained in the customFieldList.  And furthermore the parent matrix item and all of the matrix sub-items seem to have the same set of alternate image custom fields, making it impossible to correlate the images to specific subitems.

Can someone tell me how to make that correlation?  It appears that NetSuite has that data since the e-Commerce site can correctly match up color based alternate images to the color attribute picker on the product page.