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Artificial light in raw when i take photo at night
1608 27 2017-10-21
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harry.ho
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I just got my mavic a week ago, today tried to shoot photo at night and found that a lot of artifacial lights in the photo (at the darkest parts).
I tried to eliminate the cause, and it comes to RAW file. It happens only when i choose raw.
Dots are in same location for each of every photo.
Has this happened to anyone and if so what is the cause? Thanks for help.




2017-10-21
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harry.ho
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posted snapshot of raw DNG file vs. jpg file:
2017-10-21
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harry.ho
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posted snapshot of raw DNG file vs. jpg file:
raw DNG file
raw file.jpg

Jpg file
jpg file.jpg



2017-10-21
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Irate Retro
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Try running them through DJI's DNG cleaner:
http://dl.djicdn.com/downloads/inspire_1/DJI_DNG_Cleaner_V1.1.zip

Failing that, you might try using a different program to open the .dng's.  I've heard of Lightroom having a problem with some of these, but I've never experienced it myself so I can't claim any firsthand knowledge.
2017-10-21
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harry.ho
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Irate Retro Posted at 2017-10-21 09:13
Try running them through DJI's DNG cleaner:
http://dl.djicdn.com/downloads/inspire_1/DJI_DNG_Cleaner_V1.1.zip

do u have link for mac?
2017-10-21
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harry.ho
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Irate Retro Posted at 2017-10-21 09:13
Try running them through DJI's DNG cleaner:
http://dl.djicdn.com/downloads/inspire_1/DJI_DNG_Cleaner_V1.1.zip

do u have link for mac?
2017-10-21
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Irate Retro
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harry.ho Posted at 2017-10-21 10:01
do u have link for mac?

http://dl.djicdn.com/downloads/inspire_1/DJI_DNG_Cleaner_V1.1.dmg
2017-10-21
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harry.ho
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thanks.
i run it but no help maybe will try with new version of LR (iam using LR5 now)
2017-10-21
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harry.ho
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I tried open in photoshop cc, lightroom 5.6 and run dji dng cleaner but all are no help

jpg file (iso100, exp 1.0s): totally fine
Screen Shot 2017-10-22 at 13.47.52.jpg

raw dng file (iso100, exp 1.0s): having dead/hot pixel
Screen Shot 2017-10-22 at 13.42.30.png
2017-10-21
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DRONE-flies-YOU
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This is what small sensors do after warming up. No fix for this as it is physical.
2017-10-21
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harry.ho
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DRONE-flies-YOU Posted at 2017-10-21 23:22
This is what small sensors do after warming up. No fix for this as it is physical.

meaning need to fix on hardware? i just bought it for a week, should i bring back to dji as it is still in warranty?
2017-10-22
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DJI Susan
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Harry, does the issue only appears at night? could you upload the original DNG and JPG files to Dropbox and send us the link? I'd like to check the exact status.
2017-10-22
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gnirtS
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Hot pixels.  Common with pretty much all digital sensors.  Most raw converters will detect and remove them without issue.  The JPG doesnt have them because the hardware is performing the same step before processing the file into a jpg.  It's not a hardware issue.

2017-10-22
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Irate Retro
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gnirtS Posted at 2017-10-22 03:16
Hot pixels.  Common with pretty much all digital sensors.  Most raw converters will detect and remove them without issue.  The JPG doesnt have them because the hardware is performing the same step before processing the file into a jpg.  It's not a hardware issue.

I'm curious why DJI's own raw cleaner didn't remove them?
2017-10-22
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Montfrooij
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Looks like some hot pixels to me.
Very common with smaller sensors, some camera's have built in correction for this.
2017-10-22
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Aardvark
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gnirtS Posted at 2017-10-22 03:16
Hot pixels.  Common with pretty much all digital sensors.  Most raw converters will detect and remove them without issue.  The JPG doesnt have them because the hardware is performing the same step before processing the file into a jpg.  It's not a hardware issue.

Agreed, you'll get a few of these on almost every CCD or CMOS sensor.
2017-10-22
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harry.ho
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DJI Susan Posted at 2017-10-22 02:07
Harry, does the issue only appears at night? could you upload the original DNG and JPG files to Dropbox and send us the link? I'd like to check the exact status.

Thanks all for reply. pls refer to link to dng and jpg files. I tried in different shutter speed as well.
https://www.dropbox.com/scl/fo/x ... i91GCuYg1o&sm=1
2017-10-23
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fansc0fb4145
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Are you sure the mavic lights are off?
2017-10-23
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harry.ho
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fansc0fb4145 Posted at 2017-10-23 06:07
Are you sure the mavic lights are off?

yep, the LED front lights were off
2017-10-23
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harry.ho
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DJI Susan Posted at 2017-10-22 02:07
Harry, does the issue only appears at night? could you upload the original DNG and JPG files to Dropbox and send us the link? I'd like to check the exact status.

Hi Susan, this is the dropbox link
https://www.dropbox.com/sh/c0sfm ... UqbZrD1yO7AF8a?dl=0
Hope you can help
2017-10-24
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DJI Susan
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harry.ho Posted at 2017-10-24 08:57
Hi Susan, this is the dropbox link
https://www.dropbox.com/sh/c0sfmp1qe3tu6kq/AABPL1aokbyUqbZrD1yO7AF8a?dl=0
Hope you can help

Received with thanks! I'll forward to our engineers to look into the exact status.
2017-10-25
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harry.ho
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Hi Susan,

Any good news?
2017-10-27
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DJI Susan
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harry.ho Posted at 2017-10-27 02:09
Hi Susan,

Any good news?

Harry, it is still ongoing, and I will come back as soon as there is any update.
2017-10-30
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Mitch72
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harry.ho Posted at 2017-10-21 22:47
I tried open in photoshop cc, lightroom 5.6 and run dji dng cleaner but all are no help

jpg file (iso100, exp 1.0s): totally fine

What you are experiencing is noise, the smaller the image sensor the more noise you get, even on my full frame camera I will get noise if I don't mange my settings properly.

It looks worse than what it is, purely because you are just shooting black and nothing else and secondly your image is greatly underexposed ...(always check your histogram)

As a previous comment stated, a Jpg image is an already processed image by the camera/hardware ... My advice to you would be, for the time being use Jpg for your images with the drone, but also experiment with raw during daylight hours at varying ISO's so you can practice removing noise from an image.. it will also give you an idea of what ISO you can shoot at before YOU are unable to process the image.
When shooting in RAW you will notice that you will get more noise in underexposed areas of an image which is also why it looks far worse in your image.

Hope this is of some use to you?
2017-10-30
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charlesetischer
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It looks like hot pixels. The hot pixel exist on all digital sensors, and will be more with camera use time, temperature of sensor, and other factors. JPG is a image format tuned  by camera, and camera can dynamically remove hot pixels. and DNG is the raw image format,  who's purpose is to give the  original image data to user, and camera will not do tuning(user will tune it to what he want ). So camera can only remove some hot pixels detected when product for DNG. You can follow gnirtS 's suggestion. Or if you  think this is not satisfactory, you can bring back to DJI, and replace another machine.
2017-11-2
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DJI Diana
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Hi there, Our engineers replied you in the post 25#, please have a check!
2017-11-3
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harry.ho
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charlesetischer Posted at 2017-11-2 01:24
It looks like hot pixels. The hot pixel exist on all digital sensors, and will be more with camera use time, temperature of sensor, and other factors. JPG is a image format tuned  by camera, and camera can dynamically remove hot pixels. and DNG is the raw image format,  who's purpose is to give the  original image data to user, and camera will not do tuning(user will tune it to what he want ). So camera can only remove some hot pixels detected when product for DNG. You can follow gnirtS 's suggestion. Or if you  think this is not satisfactory, you can bring back to DJI, and replace another machine.

thanks @charlesetischer
Because this i dont see in other drone.
I tried DJI DNG cleaner software but no help. Any recommendation to remove it with retouch in photoshop?
2017-11-3
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DJI Thor
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harry.ho Posted at 2017-11-3 06:35
thanks @charlesetischer
Because this i dont see in other drone.
I tried DJI DNG cleaner software but no help. Any recommendation to remove it with retouch in photoshop?

Here's from the engineers: as far as I know, Photoshop has a plugin named "Camera Raw". It can handle it.
2017-11-6
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