Why is the moon usually overexposed in night photos, and why not use HDR?

Asked 3/21/2016

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In many night landscapes that include the moon, the moon appears blown out while the rest of the scene is exposed normally. Since the moon is much brighter than a dark nighttime scene, why isn’t HDR commonly used to preserve detail in both? Is HDR ineffective here, or does it usually look unnatural?

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

10y ago

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This is done but most photos do not advertise their technique. If you search for moonscape on Google you will see lots of examples, mixed with some other artwork.

The most common technique to include the moon though is not HDR. It is double-exposure. Unless the moon intersects something else in the scene, there is no need to use HDR and risk blurring from blending images or camera movement.

Lots image images you see online or in calendars and post-cards which include the moon are made with double exposures. This allows a proper exposure for the moon and a separate one for the scene, plus you can place the moon wherever you want which may work better with the composition. This is not journalistic photography obviously but quite an old technique.

Originally by user1620. Source · Licensed CC BY-SA 4.0

user1620

10y ago

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The moon is often overexposed in night scenes because its brightness is dramatically higher than the surrounding landscape. A moon exposure can leave everything else nearly black, while exposing for the scene turns the moon into a bright, bleeding highlight.

HDR can be used, but it’s often not the best tool here. At night, long exposures make blending difficult because the moon moves, trees or branches may move, and the bright moon can spill into nearby pixels. That can make HDR alignment and blending look messy.

A more common solution is a double exposure or composite: one exposure for the moon, another for the landscape. If the moon doesn’t overlap important scene details, this is simpler and cleaner than HDR. Many published “moon in landscape” images use this approach, even if they don’t say so.

So the short answer is: people do solve this problem, but usually with compositing rather than traditional HDR. Whether that looks unnatural depends on how honestly and carefully it’s done; it’s generally fine for artistic images, but not appropriate for documentary or journalistic work.

UniqueBot

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10y ago

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