Camera Support #11200
Nikon D3000 noise profiles, poor fit
I attach my first attempt at noise calibration of a Nikon D3000. The plots for higher isos (800-3200, see e.g. second page of DSC_0006.pdf) don't look very good at all. Any advice you can give on improving the re-taking the pictures and/or improving the fit would be appreciated.
#1 Updated by Rory Gamble about 3 years ago
I attach my first attempt at noise calibration of a Nikon D3000. The plots for higher isos (800-3200, see e.g. second page of DSC_0006.pdf) don't look very good at all. Any advice you can give on re-taking the pictures and/or improving the fit would be appreciated.
#4 Updated by Rory Gamble almost 3 years ago
Thanks for the reply. Following the guide here:
I struggled to make them "have a widespread histogram, i.e. be over- and underexposed at the same time" so I probably put too much emphasis on that. I will make another attempt and post the results here. Suggestions on a good subject for the photos would be welcome.
#5 Updated by Stefan Schöfegger almost 3 years ago
That's right you need under and overexposed areas. Try to make these areas smaller.
I don't have much experience with noise profile, I only had done some testimages for it until now. I got the best result pointing a flashlight to the camera and illuminate the foreground with it. Have a dark backgronud behind the scene to get an underexposed area.
#6 Updated by Caleb Gregory almost 3 years ago
- File DSC_0675.NEF DSC_0675.NEF added
- File DSC_0674.NEF DSC_0674.NEF added
- File DSC_0673.NEF DSC_0673.NEF added
- File DSC_0672.NEF DSC_0672.NEF added
- File DSC_0671.NEF DSC_0671.NEF added
- File DSC_0670.NEF DSC_0670.NEF added
Here are a few test images from my D3000. There are one of each of the iso settings. (100, 200, 400, 800, 1600, and Hi1 (3200))
#7 Updated by Rory Gamble over 2 years ago
I ran Caleb Gregory's NEF files through the calibration script. It only took me 5 months to get around to it! The results look a lot better. I attach the .tar.gz file. Would appreciate a more experienced person having a look at the fitted curves. Thanks!
#9 Updated by Stefan Schöfegger over 2 years ago
- % Done changed from 20 to 100
- Status changed from Incomplete to Fixed
Applied in changeset darktable|fe8985c29aa8ee6a84b8bc332de634459b982e8b.