White dots in night photography

[blackbirdsr72]

I am noticing pronounced white dots like hot pixels, in the images taken at night. I have everything updated from the DJI Fly app down to the Battery Firmware. Is this a problem with my settings (Manual 100 ISO with Auto shutter speed) or the image sensor is degrading? I don't recall seeing these in any of my early images taken by the Air 2S. Below are the links to the original DNG image and enhanced JPGs for your convenience.

1. Original DNG: 1. Original DNG.DNG

2. Enhanced JPG (1): 2. Enhanced JPG (1).jpg

3. Enhanced JPG (2): 3. Enhanced JPG (2).jpg


Thanks.

 

[MS Coast]

I am noticing pronounced white dots like hot pixels, in the images taken at night. I have everything updated from the DJI Fly app down to the Battery Firmware. Is this a problem with my settings (Manual 100 ISO with Auto shutter speed) or the image sensor is degrading? I don't recall seeing these in any of my early images taken by the Air 2S. Below are the links to the original DNG image and enhanced JPGs for your convenience.

1. Original DNG: https://drive.google.com/file/d/ ... jG/view?usp=sharing
2. Enhanced JPG (1): https://drive.google.com/file/d/ ... BU/view?usp=sharing
3. Enhanced JPG (2): https://drive.google.com/file/d/ ... B9/view?usp=sharing


Thanks.

All three links show this error message. You need to make the files publicly viewable.

"Sorry, unable to open the file at this time."

 

[blackbirdsr72]

All three links show this error message. You need to make the files publicly viewable.

"Sorry, unable to open the file at this time."

Sorry for the trouble. I have replaced the links with new ones. Please try again now.

 

[waynorth]

The tiny white dots are hot pixels, a common problem on almost all camera sensors during long exposures.
Your photo has a 20 second exposure, and it is inevitable to get some dead pixels. Some DSLR-cameras have built-in long exposure noise reduction, but the exposure then takes twice as long to complete.
There is not much you can do except remove the dots with a clone tool or similar, or carefully using the dust and scartches filter in Photoshop.
Here is some reading:

Long Exposure Noise Reduction Explained

Over time, every digital camera will develop “hot” or “stuck” pixels that do not work properly. They aren't usually visible, but when you're taking long exposures, they become more and more obvious. The easiest way to fix hot pixels is with a camera setting called long exposure noise reduction.

photographylife.com

 

[hansenn]

I see a few hot pixels, one red and several white ones. That,s very normal, every sensor has them.
But I also see something like a white hair/scratch just under the structure, a little bit to the right. That looks not normal to me. You better check if it occurs on all your shots. If yes, better change your drone for a new one.

 

[Meta4]

Below are the links to the original DNG image and enhanced JPGs for your convenience.

Your images are mostly black.
The subject occupies only a small area and it's very poorly lit.
The key to low light photography is to have low light, rather than no light.
Look for some subjects/scenes that are lit rather than such a large area of blackness.

 

[blackbirdsr72]

The tiny white dots are hot pixels, a common problem on almost all camera sensors during long exposures.
Your photo has a 20 second exposure, and it is inevitable to get some dead pixels. Some DSLR-cameras have built-in long exposure noise reduction, but the exposure then takes twice as long to complete.
There is not much you can do except remove the dots with a clone tool or similar, or carefully using the dust and scartches filter in Photoshop.
Here is some reading:

Long Exposure Noise Reduction Explained

Over time, every digital camera will develop “hot” or “stuck” pixels that do not work properly. They aren't usually visible, but when you're taking long exposures, they become more and more obvious. The easiest way to fix hot pixels is with a camera setting called long exposure noise reduction.

photographylife.com

Thanks for the article!

 

[blackbirdsr72]

I see a few hot pixels, one red and several white ones. That,s very normal, every sensor has them.
But I also see something like a white hair/scratch just under the structure, a little bit to the right. That looks not normal to me. You better check if it occurs on all your shots. If yes, better change your drone for a new one.

Thanks for pointing it out I will have to see my previous images of similar fashion and find out.

 

[blackbirdsr72]

Your images are mostly black.
The subject occupies only a small area and it's very poorly lit.
The key to low light photography is to have low light, rather than no light.
Look for some subjects/scenes that are lit rather than such a large area of blackness.

On point.

 

[Captain Lopez]

I am noticing pronounced white dots like hot pixels, in the images taken at night. I have everything updated from the DJI Fly app down to the Battery Firmware. Is this a problem with my settings (Manual 100 ISO with Auto shutter speed) or the image sensor is degrading? I don't recall seeing these in any of my early images taken by the Air 2S. Below are the links to the original DNG image and enhanced JPGs for your convenience.

1. Original DNG: 1. Original DNG.DNG

2. Enhanced JPG (1): 2. Enhanced JPG (1).jpg

3. Enhanced JPG (2): 3. Enhanced JPG (2).jpg


Thanks.

They are flying insects attracted by light. It's common during nights . Just my opinion .
Thanks

 

[AMann]

For as much money as DJI camera drones cost, I wish they had a way of allowing users to remap the camera to remove hot and dead pixels for this very reason. But it’s easy enough to do in post processing your images. First cover up your camera and take a long exposure in pitch dark that will give you a reference shot for where your hot pixels are. Then you can use that photo to subtract out those pixels in any of your other night shots.

 

[Jim Martin]

The links don't work for me, but I understand the issue.
I would suggest downloading DXO PureRAW 4 and use it to process your DNG file.
You get a fully functional 14 day free trial. I was amazed with how effective the program is at removing noise and recovering details. It is an order of magnitude better than Lightroom's new AI noise reduction tool. PureRAW is now part of my regular workflow.