RBA Premium Astrophotography

Nightscape Image Types

Posted: April 12th, 2017


For the last few years I've been following a rule when it comes to describing my nightscape images: if the image is a composite (definition below) I would always state it, otherwise it is not. In other words, I'd always disclose composite images upfront, but if I don't say anything about a particular image, it means it is not a composite.

The problem with this method is that it only works IF you already know the rule I follow, otherwise how would you know?

To avoid that, from now own I'll be using a tagging method, and every new image I post on social media will include a quick tag/label describing the type of image. This way, there's no guessing. Of course, you're always welcome to ask any questions about any of my images.

Please note that I use this nomenclature for nightscape images, not for deep-sky imaging.

#SingleShot: A single image, end of story.

#Blend: An image composed of several different images sharing the same field of view but captured at either different times or using different exposure settings, always during the same session (see #Composite below).

#HDR: A special type of "blend" that aims at producing an image with a larger dynamic range than what may be achievable with a single shot at certain exposure time and settings. The main difference between a BLEND and an HDR is that HDR images blend the very bright areas of long exposures with the darker equivalent of shorter exposures, and vice-versa, through an automated process. Blending, on the other hand, involves manual selections of the different images being combined.

#Stacked: a series of images of the same area and at the same settings, that were later stacked together, regardless of whether they were registered (to increase the Signal-to-Noise ratio) or not (star trails and similar images). Tracking - using a mount that "follows" the stars as Earth rotates - may or may not be involved.

#Mosaic or #Pano: An image that was built by stitching together several different photographs, all at the same settings and exposure, and during the same session, usually seconds apart.

#Composite: An image that was built from elements taken from several different  images that does not fit into any of the previous categories. A classic example in nightscape images is an image where the landscape was taken from one photograph (or set of photographs) and the sky was captured separately, on a different night or location, with different optics or pointing at a different area.

I encourage other photographers to use a similar approach when they share their image. You don't have to categorize them exactly as I did, although you're welcome to do it if you like.



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