| Joined: | Sun Apr 8th, 2012 |
| Location: | Adelaide, Australia |
| Posts: | 187 |
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...Also it's not JPEG artefacts because it happens with untouched NEF's straight from the camera.
Since we can never actually view the nef, I have to ask how are you viewing images.
Typically it will be a jpeg preview.
In the case of Lightroom, Aperture, iPhoto and other high end software it should be a damn good jpeg (updated each time a change is made) but other software might not be as good.
Also, even with nefs, under exposure and subsequent brightening or opening of shadows will enhance nasties.
Jpeg artifacts, created at export or upload, are another matter.
Try exporting a Tiff and various full res Jpegs, then compare in photoshop.
(Use 'arrange windows', match zoom (100%), then hold space and shift while click dragging to compare different areas)
The Tiff will be free of compression artifacts and only show actual image nasties
My expectation,
An underexposed and brightened image will show nasties in the tiff.
A well exposed image (unbrightened) won't show shadow nasties.
The best available jpegs will be indistinguishable from the tiff.
A good thing to try would be shooting a grey scale at a correct exposure (no gap at right edge of histogram and no, or very tiny amount of, clipping)
and repeat with 3-4 stops less exposure (400iso is a good setting).
Adjust the second image (using exposure slider) to plus 3 stops then export and compare tiffs and jpegs as described above.
My expectation,
Tiff AND Jpegs from image 2 will show shadow nasties compared to those from image 1.
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