Unity greeter just scales and trims the image so it fits the monitor resolution. So it is likely to misalign if the original image is not the same aspect ratio as your monitor. In saying that, I would expect for a fairly common resolution like mine (1366x768) it should align pretty well.
Unity greeter just scales and trims the image so it fits the monitor resolution. So it is likely to misalign if the original image is not the same aspect ratio as your monitor. In saying that, I would expect for a fairly common resolution like mine (1366x768) it should align pretty well.