Noise - DPChallenge Forums

Tamron SP AF 28-75mm f/2.8 XR Di for Canon

06/14/2007 08:25:00 PM · #1

I recently started working with RAW after getting my D80, and can't help noticing the images have a tremendous amount of noise. I use UFRAW for conversion's, could the noise have something to do with the conversion software? Even at ISO 100 there is unacceptable amounts of this noise.

strangeghost

Canon EOS-7D

06/14/2007 08:26:53 PM · #2

Can you post some examples? 100% crops are best. Often, shots in low light will have noise in the shadows. Post a few examples and let's have a look.

Nikon AF Zoom-Nikkor 18-135mm f/3.5- 5.6G ED DX

06/14/2007 08:59:11 PM · #3

Yeah, that's a good idea. Here is a converted RAW from ISO 100 in daylight, and it's not in a shadow of the image:

//img214.imageshack.us/my.php?image=rawconversiontestcroppena8.jpg

Various spots all around the image have noise like that, it's weird, for a D80 it doesn't seem much better at noise than my old sony point and shoot.

Message edited by author 2007-06-14 21:00:05.

Rebecca

Nikon D80

06/14/2007 09:09:47 PM · #4

That doesn't look so bad to me for something that will never be viewed at that size.

06/14/2007 09:15:39 PM · #5

Originally posted by Rebecca:

That doesn't look so bad to me for something that will never be viewed at that size.

Except you can see it just as clearly when zoomed out to 20 percent.

Anyways, im not sure, i think it's my raw conversion software. I did a couple of test shots at JPEG fine, at ISO 400 in the crappy lighting of my basement, and the amount of noise wasn't nearly as much.

Message edited by author 2007-06-14 21:17:17.

kawana

Sony Alpha a7R

Samyang 135mm f/2 ED UMC

06/15/2007 01:59:09 PM · #6

Originally posted by LanndonKane:

Originally posted by Rebecca:
That doesn't look so bad to me for something that will never be viewed at that size.

Except you can see it just as clearly when zoomed out to 20 percent.

Anyways, im not sure, i think it's my raw conversion software. I did a couple of test shots at JPEG fine, at ISO 400 in the crappy lighting of my basement, and the amount of noise wasn't nearly as much.

just a thought but i find that you can see things that look like mistakes more easily when your at 100% picture size (not resized i mean) and at 20%, i can often see jagged lines and things look worse. Try
resizing to like 800x??? and view at full size, it may not be noticeable. I hope this makes sense.

Heres the best example i could find, this only shows the jagged lines, but ive had some that look really noisy.

screenshot of unresized image viewed at 20%
You can see jagged lines in the circled areas, compare to the next shot

Resized to 580 x 386 viewd at 100%

Message edited by author 2007-06-15 14:11:47.