In this image, the triangle target is shown as the logarithm of the image intensity to bring out very faint features (and artifacts) in the image. Faintly visible are two "ghost" images above and below the main image. (The log-intensity grayscale has even been slightly saturated to make the ghosts, which are about 35–40 decibels fainter than the main image.) These ghosts are caused by residual amplitude-modulation ripple in the laser intensity, as can be seen in the inset figures at right. Thus, they can be removed by applying a suitable correction.