Postcard size mm關於「Postcard size pixels」標籤，搜尋引擎有相關的訊息討論：
Photo size & resolution recommendations - MOO | SupportPhoto size & resolution recommendations ; Medium Postcards. 513 x 369 pixels. 2138 x 1538 pixels ; Half Page Postcard. 831 x 543 pixels. 2598 x 1698 pixels ; Large ...缺少字詞： gl= twThe ultimate Postcard sizes and dim