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If the photos from HDR bracket were taken by hand (e.g. without a tripod), they may differ slightly in alignment. If the Alignment option is checked, the application automatically aligns all the images before merging them into a single HDR image. Therefore, Aurora HDR 2017 makes it easy to use images from an HDR bracket series, even those shot without a tripod. If you open an image from an HDR bracket without Alignment, and it is slightly blurred, simply open it again with the Alignment option enabled.
If there are moving objects in your HDR brackets — tree leaves, flags, people, etc. — it can look a bit unusual after the HDR merge process. The moving object may appear as a translucent “ghost.” This is simply because the image information is different on each different HDR bracket image (i.e. something has moved through the frame of the photo). To minimize this problem, click the Additional Settings button which will reveal a pop-over panel for enabling Ghosts Reduction. This feature will let you choose a reference image from the bracket. The software will then analyze each of the exposures and compare it to the reference image before merging them into a single HDR image. The result is that any object that changed positions between exposures will be replaced with a static object whose position is selected from one of the images of the bracket.
This feature reduces low-light noise found in color (or “chrominance”) pixels during the merging process for RAW files. Access this by clicking on the Additional Settings button which will reveal a pop-over panel for enabling Color Denoise.
This feature analyzes the merged HDR image and minimizes any chromatic aberrations which have been detected. These are typically characterized by a slight red or purplish glow along the edges of stark contrasting areas in the image. These optical aberrations however slight, are always present on any photo and may reduce picture quality. If you think that your image may include red or purple glows, click the Additional Settings button which will reveal a pop-over panel for enabling Chromatic Aberrations Reduction.
Each of these options considerably slows down the creation of your HDR image because they requires significant computing resources to analyze the images. In the case of Ghosts Reduction, it is also worth noting that this feature may not always work properly because of a lack of information to obtain a single static image from a series of moving images. Keep this option off and turn it on only when you need to fix apparent problems with ghosting.