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JPEG ARTEFACTS after converting D800 NEF to JPEG

Gerard Pas

Snowsquall, CA
4543 posts

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Gerard Pas Registered since 10th Mar 2008
Sat 02-Jun-12 11:15 PM | edited Sat 02-Jun-12 11:19 PM by Gerard Pas

I’ve run into a bit of an issue with creating images for the web such as here at Nikonians. I shoot entirely in RAW / NEF. I’m not having the camera create JPEG copies largely because space as at a premium with the D800 even on my 64GB card.

Any image I like I’ll convert to a JPEG using ViewNX2 but mostly I use Adobe LR4.1 or PS CS6 with the new 7.1 DNG Converter. The JPEGS are then reduced to size meeting posting criteria such as here: 900px on the longest side at 150kb. Even at full resolution when a dark border touches a brighter border I’m getting some “jpeg artefacts”.
I understand why this might occur from a 45MB 14 bit loosless compressed NEF file @ 7,360pc X 4,912px then downsizing to a 780 X 520px 140kb JPEG file but I’m seeing it even at the full size JPEG after conversion – when viewing the file at 3:1.
The smaller files even have a combination of “rim” lighting (a halo) as can be seen in the submitted image below. Yes you have to pixel peep to see it but it’s there; look at the head where the black meets the blue.

Anybody else encountering this and if so what are you doing about it? Any ideas?



http://www.gerardpas.com/photo/birds/_DSC-0728_780.jpg


Nikon D800, AF-S NIKKOR 300mm f/2.8G IF-ED VR, TC-17E II
1/400s @ f/7.1, ISO 100, EV -0.7, aperture priority
Nikon SB 910, TTL EV -1.7, Flash extender
tripod, PS CS6 post processing

Gerard Pas

Ars est celare artem — It is true art to conceal art.
http://www.gerardpas.com

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