image noise issue

[miaoteh]

Hi all, just a question about the noise in photos, is it going to be more obvious if we printing at 12R compared to 4R?

i tried shooting at iso 2000 with my D90 + kit lens a few days back, and here is the photo:


no post processing done except resizing the photo to 600x399 for forum use, no visible noise (to me at least ) at this size, but when i view the original photo at its original size (4288x2848), there's where the noise become so obvious. here's the 100% crop of the original photo:



so if i were to print this photo in, say, 4R, will i get a photo like the resized image, or i will get something like the 100% crop? does the print size matter here?

[catchlights]

same thing apply here,

when small not so obvious. big can see clearly.

you can print two pieces of 4R to see it yourself, one is full image, one is crop from 12R.

[night86mare]

resize the photo to 100 pixels wide, you won't see anything at all. not even noise.

[Akatsuki]

D90, being a crop camera... the noise control would definitely not be as good as a FF camera like D3 or D700.. so long you keep the picture small. The noise will not be obvious

[Rashkae]

Originally Posted by Akatsuki D90, being a crop camera... the noise control would definitely not be as good as a FF camera like D3 or D700.. so long you keep the picture small. The noise will not be obvious

Eh. That has more to do with pixel density than FF vs. crop.


TS, what you're seeing are JPEG compression artefacts coming in as a result of noise reduction. Only way to improve that is to NOT shoot at 2000 ISO (I would not recommend going above 800-1600) or try shooting in RAW, where you can use better third-part tools for noise reduction.

[miaoteh]

Originally Posted by night86mare resize the photo to 100 pixels wide, you won't see anything at all. not even noise.

so can i say that, if i am going to print a photo with image noise, to 4R photo for example, the photo taken at 12mp will have less visible noise compared to a photo taken at 4mp? if both photos were taken at exactly same time with exactly same camera/settngs/etcetc?

Originally Posted by Akatsuki D90, being a crop camera... the noise control would definitely not be as good as a FF camera like D3 or D700.. so long you keep the picture small. The noise will not be obvious

yup saw quite a few high iso noise comparison between FF and crop camera, FF realli perform better.

Originally Posted by Rashkae Eh. That has more to do with pixel density than FF vs. crop. TS, what you're seeing are JPEG compression artefacts coming in as a result of noise reduction. Only way to improve that is to NOT shoot at 2000 ISO (I would not recommend going above 800-1600) or try shooting in RAW, where you can use better third-part tools for noise reduction.

yar i normally will try to keep the iso as low as i can, but the lighting condition was kinda bad that day, plus my kit lens is too way too slow... the settings for this photo was iso 2000, f/5.6, 1/40, 105mm.

by the way, is photoshop good enough for noise reduction? or is there any other better alternatives? but then again, they can only recover the details to a certain extend right?

thanks for all your help!

[Rashkae]

Originally Posted by miaoteh by the way, is photoshop good enough for noise reduction? or is there any other better alternatives? but then again, they can only recover the details to a certain extend right?

To keep maximum details, shoot RAW.

To reduce noise, noiseninja is good.

[Limsgp]

If printing at small sizes like 4R, the noise is usually not apparent for a picture taken with DSLR.

BTW, noise reduction don't recover details, in fact, some details will be lost.. Normally the picture will became softer unless some sharpening is applied after noise reduction.

Originally Posted by miaoteh by the way, is photoshop good enough for noise reduction? or is there any other better alternatives? but then again, they can only recover the details to a certain extend right? thanks for all your help!

[calebk]

You are not likely to see detail like that in the second sample (100% crop) even with a 12R print unless you use a magnifying glass. A 4R print will quite likely resemble what you see in the first image.

[dorts]

Personally, the noise reduction done in camera seems to be much more disturbing than the noise itself.

If I am shooting at a high ISO, I will turn off the noise filter in-cam and get all the details back. After that use neat image/noiseninja to remove the noise. It preserves much more detail this way.

[night86mare]

Originally Posted by miaoteh so can i say that, if i am going to print a photo with image noise, to 4R photo for example, the photo taken at 12mp will have less visible noise compared to a photo taken at 4mp? if both photos were taken at exactly same time with exactly same camera/settngs/etcetc?

er, if you have the same sensor, they should have the same amount of noise, i do not know what down-sampling does.

but what i can tell you for sure is, if you print any image at full size, compared to 4R, then it will look less noisy in 4R