Using HDR to reduce Image Noise
Sep 25, 2018 13:07:34 #
Sorry for a late reply, but I was searching for Aurora HDR to read what I could while trying to decide whether to pre-order it (UHH's search function SUCKS! Search for multiple words -- such as Aurora HDR -- and get results for either, not necessarily a thread with both.)
A coupla comments to the OP and replies:
Yes, HDR is a great way to get good range with little noise, but it works well only with static subjects. I'm a long-time fan of HDR, as there are many scenes that even a camera with the best DR and using the finest post processing skills just cannot render well (such as night cityscapes).
Yes, always use aperture-priority or full manual (including ISO) when shooting brackets for HDR (of course, the types of images -- static -- used for HDR are best shot that way anyway). Now that has me thinking: If I have my camera set to shutter-priority then use in-camera HDR, will it switch to aperture-priority for those shots? I'm inclined to think it must.
Yes, long exposure noise reduction works well (at least it does on my Sonys), but it requires you to wait the length of your exposure to take your next shot.
DRO, or Dynamic Range Optimization (in Sony parlance, and called something else on other models) is often a good choice for an in-camera boost without taking multiple bracketed shots.
Anyone have thoughts on Aurora HDR? The new version, due out Oct. 5 and available to pre-order now for $89, claims to use AI to remove artifacts such as halos automatically.
A coupla comments to the OP and replies:
Yes, HDR is a great way to get good range with little noise, but it works well only with static subjects. I'm a long-time fan of HDR, as there are many scenes that even a camera with the best DR and using the finest post processing skills just cannot render well (such as night cityscapes).
Yes, always use aperture-priority or full manual (including ISO) when shooting brackets for HDR (of course, the types of images -- static -- used for HDR are best shot that way anyway). Now that has me thinking: If I have my camera set to shutter-priority then use in-camera HDR, will it switch to aperture-priority for those shots? I'm inclined to think it must.
Yes, long exposure noise reduction works well (at least it does on my Sonys), but it requires you to wait the length of your exposure to take your next shot.
DRO, or Dynamic Range Optimization (in Sony parlance, and called something else on other models) is often a good choice for an in-camera boost without taking multiple bracketed shots.
Anyone have thoughts on Aurora HDR? The new version, due out Oct. 5 and available to pre-order now for $89, claims to use AI to remove artifacts such as halos automatically.
Sep 25, 2018 16:27:19 #
rcarol wrote:
The results can be very impressive. I've used this feature as well. The only issue I have with this technique is that the camera selects all of the parameters (aperture, shutter speed & ISO). At least I have not figured out how to change any of these. If you have found out differently, please let me know how to do this.
rcarol,
You are correct about the in-camera HDR function: it functions in an Auto mode; the camera picks the exposure parameters.
However, the Low Noise feature can be activated in M, Av, Tv and P modes. The user has complete control over all settings. (I have a 77d)
M. Goldfield
Sep 25, 2018 16:52:03 #
rcarol wrote:
I thought that I would pass this on. I was watchin... (show quote)
You could also have two or three cameras and trigger them simulataneously.
Seems like averaging of mutliple-exposures is going to great lengths to work-around a
noise problem that has been solved years ago in the industrial and scientific world by
super-cooling the sensor.
If Nikon or Canon introduced a camera with one of those, they'd really have something.
It's not totally unfeasible:some table-top scientific instruments do use a cryostat. And
consumers seem wlling to pay a lot of money for "pro" cameras.
It wasn't that long ago that astronomers did use the same type of "sensors" as photographers:
Kodak sheet film. But the gap between state-of-the-art cameras and what consumers can buy
has gotten very wide and is getting wider all the time.
The current state-of-the-art digital camera is the one built by SLAC for the Large Synoptic
Survey Telescope (LSST), which uses e2v sensors made by Teledyne.
https://www.forbes.com/sites/meriameberboucha/2018/08/22/new-milestone-for-the-worlds-largest-digital-camera/
https://www.lsst.org/about/camera
http://camera-wiki.org/wiki/LSST_Camera
http://optics.org/news/8/10/25
It's nice to know what's achievable now with current technology -- in addition to what's being
mass-produced for sale to consumers.
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