![]() It's even possible to generate HDR panoramas from single, non-bracketed images taken in automatic exposure mode. Just tell PTGui which images are bracketed sets by linking them. Better yet, the number or sequence of bracketed images doesn't even have to be constant anymore. Because each set of bracketed images will be separately merged to HDR, bracketing in automatic exposure mode is now possible. Then the HDR images are blended into a panorama. PTGui Pro 12 now also offers the reversed workflow as an option: first, all bracketed sets are merged to HDR. Blend planes required a consistent exposure for each blend plane and therefore the panorama had to be taken in manual exposure mode. Finally the blend planes are merged to an HDR panorama or combined using Exposure Fusion. HDR in PTGui 11 is based around 'blend planes': at each EV a complete panorama is stitched and blended. The following animation shows the differences between unblended, Multiband blending and the new Zero Overlap blending: Even images with significant exposure differences are blended very well. Combined with optimum seam placement this can create absolutely seamless panoramas even in difficult situations with moving objects. Only the area enclosed by the seams is used, with no risk of ghosting from hidden objects. Brightness differences are distributed across the entire image, such that any differences are minimized where the images meet at the seams. If the overlap is narrow and the brightness difference large, the steep change in brightness will remain noticeable.įor PTGui 12 a new blending engine has been built which requires no overlap at all. Also, only the overlap region is available for equalizing brightness differences. This happens even if the object is nearby the seam, but not actually cut through by it. Generally these algorithms cannot distinguish between brightness differences caused by exposure variation and brightness differences caused by moving objects any moving objects in the overlap region remain visible as faint ghosts or halos. In the overlap region a gradual transition is made from the average brightness of one image to the next. These blending algorithms do their work in the overlap region of the images and therefore need a certain amount of overlap. Most existing panoramic blenders (including PTGui 11, Enblend, SmartBlend, AutoPano) use a multi-band pyramid blending algorithm. The seam finding algorithm will recognize the object's contours and re-route the seam in an optimum path around it. Masking doesn't have to be done precisely at all: usually a green or red dot somewhere on an object is sufficient. As in PTGui 11 the seams can be manipulated using masks: a red mask will exclude an object and move the seam away from that area, while a green mask forces an area to be included in the blended panorama. Seam placement happens automatically and on the fly, but you can still fully control where the seams should go. The Panorama Editor and Detail Viewer show a live preview of the seams. Also, stitching errors from parallax will be hidden as much as possible. It will attempt to automatically route the seams around moving objects. PTGui Pro 12 will analyze the regions where images overlap, and place the seams in those areas where there is the least difference between the overlapping images. Optimum seam placement (Pro version only) ![]() But under the hood it features a rewritten stitching engine and a brand new blender! On the outside PTGui 12 may look much like the previous version. ![]()
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