ISO 1600 vs. 3600 sharpness

[pup]

If the same shot was taken except one shot has ISO 1600 and one has 3200 will there be a lower sharpness in the 3200? Or does it not matter?

[chris clements]

The issues with increasing ISO revolve around noise, colour and contrast, but not particularly 'sharpness'

[superdiver]

Try a comparison and see...sounds like an interesting question. My quess is that in the long run it might just cuz of what you might have to do to clean up the other problems...

The short answer is no...from what I know...

[liza]

Nah. ISO 3200 will just have more noise.

[krazziecliff]

Thats interesting. More noise is definitely the blanker answer, but maybe a little research wont kill...hmmm...thats my next project

[Andy_T]

If an image has less noise, it certainly can be better sharpened than an image with lots of noise.

What is noise? Pixels of different colours in an otherwise uniform area.
What is sharpening? Making differences in colour stand out more.

So if you sharpen two images, the noisier one will not accept as much sharpening before becoming unacceptable.
Of course, you could use noise reduction software (like the free noiseware community edition (www.imagenomic.com)) that can remove noise and at the same time also sharpen the image.

Best regards,
Andy

[-MasterChief-]

i agree with Andy. ultimately, the pic that has the higher noise will have a less than sharp image --- specially if you apply any noise reduction software to it. noise removes detail.

[Hellashot]

The issues with increasing ISO revolve around noise, colour and contrast, but not particularly 'sharpness'

Yes it does. As noise increases, sharpness decreases because of noise. You should notice that you are able to add less USM to shots as ISO increases. If you apply the same amount as you would to iso100 for iso1600, the result would be an over sharpneded picture.

[René Damkot]

*Detail* might decrease. Sharpness not neccesarily. Ever noted that percieved sharpness *increases* if you add noise?

In this case, I think when shooting jpg sharpness will be lower in the ISO 3200 shot, because of the in camera NR (depending on camera model)

[Andy_T]

However, one thing to consider ...

if the ISO 3200 shot gives you 1/60 shutter time and the ISO 1600 shot gives you only 1/30, I'd go for the ISO 3200.

You can correct noise in images, but not motion blur.

Best regards,
Andy