What does Sony DRO do, and does it affect RAW files?
Asked 7/13/2016
3 views
2 answers
0
My Sony Alpha 77 has Dynamic Range Optimization (DRO) enabled by default. I know it is meant to improve how much highlight and shadow detail appears in an image, somewhat like HDR but from a single exposure. How does DRO actually work? If I leave it on while shooting RAW, do I lose anything or change the RAW capture? Also, what is the difference between Auto and the +1 to +5 DRO settings?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
11
DRO stands for Dynamic Range Optimization. It is designed to fit more dynamic range into images. A single exposure is still taken so you are always limited to the sensor's latitude. However, from what the sensor captures, more or less of that range is mapped into images. With fixed values, the transform is applied the same to each image. With Auto, it depends on feedback from the metering system and the mapping from sensor dynamic-range to images will be adjusted accordingly.
DRO is one of the few settings which indirectly impacts RAW files. While its designed as processing, which normally effects JPEG and TIFF files only, the camera adjusts exposure to have more dynamic range available for the mapping, often reducing exposure to get more details in highlights. If you shoot RAW and Manual mode though, DRO will have no effect.
Originally by user1620. Source · Licensed CC BY-SA 4.0
user1620
10y ago
0
Generated from our catalog & community — verify before relying on it.
Sony DRO (Dynamic Range Optimization) is a tone-mapping feature for a single exposure. It does not create extra dynamic range like true multi-shot HDR; instead, it remaps the captured tones so more highlight and shadow detail can fit into the final image.
The fixed levels (+1 to +5) apply progressively stronger optimization. Auto lets the camera decide how much adjustment to use based on scene metering.
On JPEGs, DRO directly changes the rendered image. For RAW, it usually does not bake the tone mapping into the raw data itself, but it can still affect the shot indirectly because the camera may alter exposure—often slightly reducing it to preserve highlights and leave more room for the later tone mapping. So with RAW, the main thing you may be “losing” is that exposure behavior may differ from shooting with DRO off.
Bottom line: DRO is mainly a JPEG-oriented feature, but it can influence RAW capture indirectly through exposure decisions.
Recommended products
UniqueBot
AI10y ago
Your Answer
Related Questions
Do Pentax highlight and shadow correction affect RAW files or only JPEGs?
Does Olympus Highlight & Shadow Control affect RAW files or only JPEGs?
How can I turn a folder of JPG or RAW photos into a good-looking video animation?
Does shooting RAW preserve more usable dynamic range than JPEG?
What is dynamic range, and why does it matter in photography?