Initial merging

Aurora HDR works on single images or multiple exposures, and initial merging options change depending on the number of images loaded. If a single image is provided to the software, only the "Chromatic Aberration Reduction" option is available. If multiple exposures are selected, "Alignment" and "Ghost Reduction" options are revealed. Alignment should be checked if the multiple images were recorded while holding the camera by hand vs. a tripod. Ghost Reduction relates to minimizing the effects of moving objects in a multi-exposure merging process.^[4] If you have moving objects, choose this function.

Interface

The user interface of Aurora HDR consists of the following:

• Large preview window
• Open & Export/Share
• Zoom & navigation controls
• Comparison controls
• Undo/Redo
• Cropping tool
• Move (hand) tool
• Brush
• Layers
• Histogram
• Presets
• Advanced tools

Presets

Presets are pre-installed one-click controls that apply a specific "style" to the tone-mapped image. This style is created entirely by the use and modification of the Advance tools containing in the software. The Preset panel in Aurora HDR Pro contains 7 separate categories applicable to all types of photos: Trey Ratcliff's Signature presets, Basic, Realistic HDR, Dramatic, Landscape, Indoor, Architecture, each of which contain thumbnail graphics representing several or dozens of styles. In addition, users may designate a preset as a "favorite" or create their own.

Tools

Aurora HDR comes with an extensive list of tools and functionality designed to help photographers edit their images using HDR techniques. The tools range from those that can help reproduce a natural, realistic look to those that enhance images towards a more fantasy-like direction. Each tool listed below has a unique set of controls to modify its effects.^[5]

• Tone Mapping
• Tone
• Structure
• HDR Denoise
• Image Radiance
• Color
• Details
• Glow
• Top & Bottom Lighting^[6]
• Tone Curve
• Color Filter
• Color Toning
• Vignette

Layers, brushes and masking

Aurora HDR Pro features the ability to create up to 9 layers (4 in the Mac App Store version), and provides brushing and masking functionality common in many image-editing software programs. Layers can be automatically loaded with either (a) the previous layer, (b) a custom texture, (c) the original tone-mapped image, or (d) any one of the exposures in the bracketed set. Brushes and masking, including Gradient Masking are used to selectively apply or erase effects from the image. An advanced feature of the Pro version of Aurora HDR is to designate a layer as one that contains "Luminosity Masking."

Opening, file formats and exporting

Aurora HDR opens a variety of popular image file formats, including RAW camera files that are the native to specific camera manufacturers (e.g. Nikon's NEF and Canon CR2). It saves in a native file format (.mpau) which allows for the resumption of editing after saving and closing the file. The software exports in the following file formats: JPG, PNG, GIF, JPG-2000, TIFF, Photoshop, and PDF, and can also transfer images directly into Skylum's Creative Suite for further editing.

Sharing

The software permits sharing to image galleries like 500px, Smugmug and Flickr, plus social networks like Facebook and Twitter. Additionally Aurora HDR can send images via email or Apple Messages.