Even after snapping the bitmap bbox to the corner nodes of the stroked rectangle forming the picture frame, other viewers render the the width of the scaled image smaller (Firefox: on both left and right sides a vertical gap between image and stroke of 7px + 5px half-stroke-width).
Even after snapping the bitmap bbox to the corner nodes of the stroked rectangle forming the picture frame, other viewers render the the width of the scaled image smaller (Firefox: on both left and right sides a vertical gap between image and stroke of 7px + 5px half-stroke-width).