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ISO Sensitivity / Noise levels (contd.)

UPDATE 18/Dec/06: In our original review a mistake was made in the measurement of ISO sensitivity, this has now been corrected and the releveant pages of this review updated.

RAW noise or just how much in-camera noise reduction

One thing we observed quite early when dealing with higher sensitivity images from the EOS 400D was the difference in noise levels between JPEG and RAW. This tells us that the camera is actually applying fairly significant and sophisticated noise reduction which has the strongest effect at ISO 800 and 1600. Obviously the RAW data has no noise reduction applied, so when we convert we 'reveal' the actual noise produced by the sensor.

Interestingly Canon's own Digital Photo Professional exposes this most clearly, especially at ISO 1600, with clear noise as well as white speckles in shadow areas (although thanks to what seems to be a complete lack of noise reduction, lots of detail). What we can conclude from this is that the in-camera NR is actually very good, keeping luminance noise down while maintaining detail, however it's a pity there isn't at least a little chroma NR to remove those color blotches.

JPEG vs. RAW (ISO 400 - 1600)

  • JPEG: Jpeg original from camera
  • DPP: Digital Photo Professional 2.2
  • ACR: Adobe Camera RAW 3.6 beta
JPEG
ISO 400
RAW (DPP)
ISO 400
RAW (ACR)
ISO 400
JPEG
ISO 800
RAW (DPP)
ISO 800
RAW (ACR)
ISO 800
JPEG
ISO 1600
RAW (DPP)
ISO 1600
RAW (ACR)
ISO 1600

Luminance noise graph (JPEG vs. RAW)

As you can see noise levels from RAW converted files are considerably higher than JPEG from the camera. Up to ISO 400 this would be difficult to see, however at ISO 800 and 1600 it would be a lot more obvious.

Indicated ISO sensitivity is on the horizontal axis of this graph, standard deviation of luminosity on the vertical axis.

Chroma (color) noise graph (JPEG vs. RAW)

Indicated ISO sensitivity is on the horizontal axis of this graph, standard deviation of color on the vertical axis.

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Comments

Total comments: 7
selacab

great camera I took mine around australia Great photo's

0 upvotes
Killerspec

I bought the EOS Rebel Xti a while back now have some holiday time on my hands over the xmas period and would like to learn more about the camera. Anyone able to tell me how I am able to take RAW format pictures with this camera.

Thanks.

0 upvotes
reanim888

The Canon 400D remains a very good first dSLR, with a balance of automatic, semi-automatic and manual controls to progress through as your creative photography skills improve.
I think it's very important for every Digital Photo Camera!

1 upvote
Sam Spark

I think all of the camera makers (Canon, Nikon, Sony, etc.) have been doing the same thing… just making minor, poor, or inconsequential upgrades to their cameras. I think they all got caught blindsided by the smart phone market.

1 upvote
canonaholic

Was a great little thing

Comment edited 45 seconds after posting
0 upvotes
512A385C4A114355B73DB0DC6598F611

I want to know if kiss digital 400D can be used to shoot videos and movies. Can it also be used to shoot on long hours?

0 upvotes
canonaholic

No! This has no video capability whatsoever!
Doesn't even have live-view!!!

0 upvotes
Total comments: 7