Eliminating Ghost Artifacts
Next we need to get rid of any blurry areas or “color blooms” that may be affecting the image; these are sometimes called ghosts. You can accomplish this by clicking the Remove Ghosts checkbox. After the initial progress meter above the thumbnails finishes, click each thumbnail to see which one provides the best result, as seen in Figure 2. Each time you click a new thumbnail, you will need to wait a few seconds for the preview to re-generate.
Figure 2 The first part of the HDR Toning process is to set up the image for 32-bit output, and remove any ghost artifacts that might cause blurring or “color blooming” in the scene.