D810 chroma noise at low ISO...

sk66

sk66

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I've started doing a bunch of low key dark on dark/ black on black images and I'm finding a lot of chroma noise in the D810.

For instance, here is a 1:1 crop of a tiny section of the image posted here:


Screen Shot 2014-11-09 at 9.14.48 AM by sk66 on Talk Photography

That crop is AFTER noise reduction and even an HSL layer tyring to get it to smooth out. The image is not a low light/natural light/long exposure...

Now, I know that 1:1 critiquing of an image over 7000px wide is overkill.
And I know that some chroma noise is common in dark areas where the sensor really doesn't have much to work with.
And I know higher ISO's will make it worse.

But I'm finding it pretty bad even at ISO 100/200 (which look the same to me). And I can't find a good way to really deal with it.

I'm guessing it's just a factor of the high MP count? Anyone else experiencing the same/different?

(some of you may not be able to see much of anything in the crop... monitor calibration will make a big difference in seeing it)
 
How are you exposing / processing? Are you boosting the image at all post capture or exposing to the right?
 
woof woof said:
How are you exposing / processing? Are you boosting the image at all post capture or exposing to the right?
Click to expand...
Pretty much as captured... a little gamma shift to get a bit more separation.

After the issue became apparent I decided to try exposing to the rt and pulling down. Works fine for higher contrast, but I can't tell if it helps w/ "grayscale" tonality.

Just doesn't seem like it should be required at base ISO...
 
sk66 said:
Pretty much as captured... a little gamma shift to get a bit more separation.

After the issue became apparent I decided to try exposing to the rt and pulling down. Works fine for higher contrast, but I can't tell if it helps w/ "grayscale" tonality.

Just doesn't seem like it should be required at base ISO...
Click to expand...

I looked at some of my A7 (24mp) files at 100% and couldn't find any that looked like yours even with ISO's into the k's. To try and get somewhere near your shot I shot a sparkly smartphone case against a black fibre background with shadow in shot too without ETTR, the cursor was smack in the middle of the exposure scale, and again at 100% I couldn't get anywhere near your results.

So, dunno. Sorry.
 
I wonder if it's because it's black BG paper... it has a slight texture. (Savage super black #20)

I think that makes sense as it's really only apparent in shadow transitions...
 
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