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Does red noise even at low values mean a hardware problem with my camera's sensor?

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1

I have an Canon 200D (Rebel SL).

I am concerned about the red noise in the darker parts of the picture, at low ISO values. Especially in the blue sky.
Could this be a hardware problem with a sensor?

I post screenshots and two original RAW files:

https://megaupload.nz/U0k69aufbd/IMG_1590_CR2

https://megaupload.nz/a9la96u0b9/IMG_1673_CR2

sensor iso noise color-red

share|improve this question

edited 7 mins ago

mattdm

120k39356646

asked 3 hours ago

WedrowyczWedrowycz

82

New contributor

Wedrowycz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

1

I have an Canon 200D (Rebel SL).

I am concerned about the red noise in the darker parts of the picture, at low ISO values. Especially in the blue sky.
Could this be a hardware problem with a sensor?

I post screenshots and two original RAW files:

https://megaupload.nz/U0k69aufbd/IMG_1590_CR2

https://megaupload.nz/a9la96u0b9/IMG_1673_CR2

sensor iso noise color-red

share|improve this question

edited 7 mins ago

mattdm

120k39356646

asked 3 hours ago

WedrowyczWedrowycz

82

New contributor

Wedrowycz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

I have an Canon 200D (Rebel SL).

I am concerned about the red noise in the darker parts of the picture, at low ISO values. Especially in the blue sky.
Could this be a hardware problem with a sensor?

I post screenshots and two original RAW files:

https://megaupload.nz/U0k69aufbd/IMG_1590_CR2

https://megaupload.nz/a9la96u0b9/IMG_1673_CR2

sensor iso noise color-red

share|improve this question

edited 7 mins ago

mattdm

120k39356646

asked 3 hours ago

WedrowyczWedrowycz

82

New contributor

Wedrowycz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 7 mins ago

mattdm

120k39356646

asked 3 hours ago

WedrowyczWedrowycz

82

New contributor

Wedrowycz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 7 mins ago

mattdm

120k39356646

asked 3 hours ago

WedrowyczWedrowycz

82

New contributor

Wedrowycz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 7 mins ago

mattdm

120k39356646

edited 7 mins ago

mattdm

120k39356646

asked 3 hours ago

WedrowyczWedrowycz

82

New contributor

Wedrowycz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 3 hours ago

WedrowyczWedrowycz

82

1 Answer
1

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3

No, this is not a problem.

I see red noise. I see green noise. I see blue noise.

That's not a surprise because there are three main colors in the Bayer filter, and the pixels beneath all of those three main colors are noisy.

The red and green noise are however more prominent, because the image is blue.

This noise is called chroma (chrominance) noise, as opposed to luma (luminance) noise.

You need to take a look at various noise reduction algorithms. Chances are your camera has already one for JPEG files but it won't be used for RAW files.

For RAW files, you can use the noise reduction algorithms of RawTherapee. Darktable too has some noise reduction algorithms, but I have found them to be much poorer than the ones in RawTherapee.

When you turn on noise reduction in RawTherapee, it should remove chroma noise effectively. To remove luma noise, there is an adjustable slider.

If you want less noise, consider using ISO 100 which is slightly less noisy than ISO 200. You could also consider switching to a camera that has Sony Exmor sensor which is somewhat less noisy than Canon sensors, but that would be expensive if you have already invested lot of money into Canon. You could also consider a full frame camera (or a full frame camera with Exmor sensor), but that would be even more expensive.

Typically there is less noise when:

• The sensor is big (full frame)


• The sensor is good (Sony Exmor)


• The ISO level is low


• Noise reduction algorithms are used

share|improve this answer

answered 2 hours ago

juhistjuhist

3018

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I wouldn't say that other sensors are necessarily better (outside a laoratory) in noise handling: dxomark.com/Cameras/Compare/Side-by-side/…
  
  – flolilolilo
  2 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you, juhist, for your comprehensive reply.
  
  – Wedrowycz
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @flolilolilo Well, I have seen some low-light photos taken with an iPhone camera using Sony Exmor sensor, and I was positively impressed for being so good given the sensor size. It may be the case that for APS-C or FF size the differences diminish to marginal.
  
  – juhist
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I'd think that is down to noise reduction.
  
  – flolilolilo
  1 hour ago
  

  
  
  
  

add a comment | 

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3

No, this is not a problem.

I see red noise. I see green noise. I see blue noise.

That's not a surprise because there are three main colors in the Bayer filter, and the pixels beneath all of those three main colors are noisy.

The red and green noise are however more prominent, because the image is blue.

This noise is called chroma (chrominance) noise, as opposed to luma (luminance) noise.

You need to take a look at various noise reduction algorithms. Chances are your camera has already one for JPEG files but it won't be used for RAW files.

For RAW files, you can use the noise reduction algorithms of RawTherapee. Darktable too has some noise reduction algorithms, but I have found them to be much poorer than the ones in RawTherapee.

When you turn on noise reduction in RawTherapee, it should remove chroma noise effectively. To remove luma noise, there is an adjustable slider.

If you want less noise, consider using ISO 100 which is slightly less noisy than ISO 200. You could also consider switching to a camera that has Sony Exmor sensor which is somewhat less noisy than Canon sensors, but that would be expensive if you have already invested lot of money into Canon. You could also consider a full frame camera (or a full frame camera with Exmor sensor), but that would be even more expensive.

Typically there is less noise when:

• The sensor is big (full frame)


• The sensor is good (Sony Exmor)


• The ISO level is low


• Noise reduction algorithms are used

share|improve this answer

answered 2 hours ago

juhistjuhist

3018

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I wouldn't say that other sensors are necessarily better (outside a laoratory) in noise handling: dxomark.com/Cameras/Compare/Side-by-side/…
  
  – flolilolilo
  2 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you, juhist, for your comprehensive reply.
  
  – Wedrowycz
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @flolilolilo Well, I have seen some low-light photos taken with an iPhone camera using Sony Exmor sensor, and I was positively impressed for being so good given the sensor size. It may be the case that for APS-C or FF size the differences diminish to marginal.
  
  – juhist
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I'd think that is down to noise reduction.
  
  – flolilolilo
  1 hour ago
  

  
  
  
  

add a comment | 

3

No, this is not a problem.

I see red noise. I see green noise. I see blue noise.

That's not a surprise because there are three main colors in the Bayer filter, and the pixels beneath all of those three main colors are noisy.

The red and green noise are however more prominent, because the image is blue.

This noise is called chroma (chrominance) noise, as opposed to luma (luminance) noise.

You need to take a look at various noise reduction algorithms. Chances are your camera has already one for JPEG files but it won't be used for RAW files.

For RAW files, you can use the noise reduction algorithms of RawTherapee. Darktable too has some noise reduction algorithms, but I have found them to be much poorer than the ones in RawTherapee.

When you turn on noise reduction in RawTherapee, it should remove chroma noise effectively. To remove luma noise, there is an adjustable slider.

If you want less noise, consider using ISO 100 which is slightly less noisy than ISO 200. You could also consider switching to a camera that has Sony Exmor sensor which is somewhat less noisy than Canon sensors, but that would be expensive if you have already invested lot of money into Canon. You could also consider a full frame camera (or a full frame camera with Exmor sensor), but that would be even more expensive.

Typically there is less noise when:

• The sensor is big (full frame)


• The sensor is good (Sony Exmor)


• The ISO level is low


• Noise reduction algorithms are used

share|improve this answer

answered 2 hours ago

juhistjuhist

3018

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I wouldn't say that other sensors are necessarily better (outside a laoratory) in noise handling: dxomark.com/Cameras/Compare/Side-by-side/…
  
  – flolilolilo
  2 hours ago
  
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you, juhist, for your comprehensive reply.
  
  – Wedrowycz
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @flolilolilo Well, I have seen some low-light photos taken with an iPhone camera using Sony Exmor sensor, and I was positively impressed for being so good given the sensor size. It may be the case that for APS-C or FF size the differences diminish to marginal.
  
  – juhist
  2 hours ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I'd think that is down to noise reduction.
  
  – flolilolilo
  1 hour ago
  

  
  
  
  

add a comment | 

No, this is not a problem.

I see red noise. I see green noise. I see blue noise.

That's not a surprise because there are three main colors in the Bayer filter, and the pixels beneath all of those three main colors are noisy.

The red and green noise are however more prominent, because the image is blue.

This noise is called chroma (chrominance) noise, as opposed to luma (luminance) noise.

You need to take a look at various noise reduction algorithms. Chances are your camera has already one for JPEG files but it won't be used for RAW files.

For RAW files, you can use the noise reduction algorithms of RawTherapee. Darktable too has some noise reduction algorithms, but I have found them to be much poorer than the ones in RawTherapee.

When you turn on noise reduction in RawTherapee, it should remove chroma noise effectively. To remove luma noise, there is an adjustable slider.

If you want less noise, consider using ISO 100 which is slightly less noisy than ISO 200. You could also consider switching to a camera that has Sony Exmor sensor which is somewhat less noisy than Canon sensors, but that would be expensive if you have already invested lot of money into Canon. You could also consider a full frame camera (or a full frame camera with Exmor sensor), but that would be even more expensive.

Typically there is less noise when:

• The sensor is big (full frame)


• The sensor is good (Sony Exmor)


• The ISO level is low


• Noise reduction algorithms are used

share|improve this answer

answered 2 hours ago

juhistjuhist

3018

share|improve this answer

answered 2 hours ago

juhistjuhist

3018

answered 2 hours ago

juhistjuhist

3018

answered 2 hours ago

juhistjuhist

3018