Not able to place images at the boundaries on android devices(samsung tab) in layout mode

Not able to place images at the boundaries on android devices(samsung tab) in layout mode. Please see the attachment, you can see the gap at the extreme right side, i am getting the screen width and try to place at the extreme right side but i am getting the gap. my code is, bgImage = display.newImage( “gamePlayImages/plainPopIphone.png”, true ) bgImage.x = sizeWidth - bgImage.width/2 bgImage.y = sizeHeight / 2 screenGroup:insert(bgImage)