Noise reduction - downsizing?

[Wookie]

just busy sorting some horrible pics ( quality not content . . . ok, content too) from sunday. I had to run max iso 1600 in dim lighting and got the expected smattering of noisy spangles over everything, especially bright spots on dark areas.

I was doing a quick play & resized from RAW to small jpeg to slap a couple of pics on the forum for those who had been following my irish dancing thread, and I noticed that resizing down appeared to kill a lot of the fine grained noise. It seems logical to me

. . . am I correct? :shrug:

is downsizing a good noise reduction tool?

 

[davidbridges]

I think the process between Raw and Jpeg will make alot of the noise dissapear. I find that my camera raw highlights noise more than the final exported JPEG. Just my suggestion

 

[blinkerz]

jpeg exporting normally does 0.3 blur as default ...

 

[RobbieW]

jpeg exporting normally does 0.3 blur as default ...

so once you save for web is it worth tweaking the jpg image again? i was always told if possible save a jpg only once because everytime you do the quality drops due to compression.

Rob

 

[moomike]

Jpg saving does destroy image data & I never save jpg's more than once unless absolutely necessary (you won't really notice any image degradation until after quite a lot of saves but it does still happen subtly with each save)

 

[laser_jock99]

If you are downsizing a decent sized original for web display, do a slight blur on the original prior to downsize- this will remove a lot of the noise especially in flat colour areas like skies.