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jlippert Feb 21, 2005 2:56 PM

1 Attachment(s)
The first of the 4 photos is untouched except for cropping and resizing.

The 3 others - more or less under-exposed -have their lower half histogram adjusted in PSP and their right part noise reduced with standard settings also in PSP. They are saved as .gif in order to avoid extra jpeg artifacts which show up in this kind of picture. Exposure conditions are marked in the photos.


NickTrop Feb 21, 2005 9:15 PM

Nice test. Thank you for posting. I am suprised at how nice the third turned out.

ianperegian Feb 21, 2005 9:24 PM

That's an interesting set of comparisons. I wondered what setting was used for in-camera noise reduction? I noticed that the 3rd shot (F2.8, 1/200, 400) was taken at effectively nearly 2 stops underexposed compared with the first shot (2.8, 1/15, 100). I think other people have said that underexposure at 400 ISO tends to worsen the noise. Maybe if the exposure value had matched the first shot, the 3rd shot would have "cleaned up" even more? Anyway, it shows that a usable image can be achieved at 400 after doing PP even at quite severe underexposure.

jlippert Feb 22, 2005 6:11 AM


All other camera settings were 'normal'


gmosc Feb 22, 2005 10:51 AM

Is this a suggestion that it´s the computer and it´s way of boosting the image in the camera that´s guilty of all the noise on iso400 pictures?

Is there a suggestion that a firmware update could help in the future?

jlippert Feb 22, 2005 1:54 PM

No - I think the only ways to improve the signal to noise ratio in the sensor are either larger sensors or better materials and production procedures.


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