Unlinking photo's

When uploading some pictures into the media library I linked them to a page I just made. I deleted the page, made a new one, and wanted to link the pictures to the new page.
But in the media library I can’t find how to ‘unlink’ the pictures to the previous page. I don’t feel like deleting all the pictures and uploading them all again, is there a simple way to unlink and relink them again?