Dynamic PhotoHDR: Understanding Anti-Ghosting

Dynamic PhotoHDR is sophisticated photo software for combining images of different exposures to get a single HDR (High Dynamic Range) photo. In the technique of creating an HDR image, several shots are taken of the same scene with varying exposures. While taking the shots of the same scene (which may not be static), certain objects in the frame might move. For example, it could be a person walking across in the frame. When all the shots are aligned and combined for producing an HDR image, the movement of the object will cause ghost images to appear in the composite image.

Anti-Ghosting Technique

Dynamic PhotoHDR applies a simple and direct anti-ghosting technique to get rid of this problem. The software enables the user to paint over the ghost images by applying an Anti-Ghosting Mask. This feature provides a paint brush and the size can be adjusted with slider controls; you just need to paint over the ghost objects. You also need not be very precise as long as you paint over the ghost objects totally including their shadows.

The number of ghost images you need to paint over will depend on the number of shots you have taken. For example, if you have taken three shots (which is usually the minimum), you will need to paint over the two images which show the movement. If you have taken more shots, then you need to paint over all the ghost objects of aligning pairs. There is a "Quick Preview" button which will show you how you are progressing. When you click on this button, it will tone map and merge the image (and in a few seconds show you the result).