D80 x D7k IQ tests

Started May 28, 2011 | Discussions thread
rhlpetrus
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Re: D80 x D7k IQ tests
In reply to eNo, May 29, 2011

I was using A for WB and each camera was doing something different, D7k closer to real colors but still a bit too cold. At 5200, even though not exact, gave pretty good white on D7k and a slight warm cast on D80. I thought they would produce very close colors, not exactly. The lens, a good black, turned out a bit on the green side on the D80. This is pretty common for Nikons actually, I tried changing temperature in CNX2 but could't really change that into a neutral white, it just changed but never got like D7k.

Looking at the RGB histograms one sees the difference in color balance. I was able to match them, but had to reduce temperature for D80, then increase a bit for D7k and reduce green for D80 to get white to be neutral.

But see below a real life example of tone gradation, color depth and DR.

eNo wrote:

Renato - thanks for doing these! Quick impression, not a "big deal difference", but...

rhlpetrus wrote:

Both cameras set with WB in daylight setting, since I was getting light through a balcony door open. ISO at 100. Day slightly overcast but bright.

I think this won't work as well as using a common reference white or gray card. I discovered that the biggest differences in color rendition happened when I forced the same temperature or default/pre-programmed WB setting. Auto-WB and gray card reference methods actually matched color better. My theory here is that the Auto-WB algorithm seeks to compensate for inherent color casts in the image chain. The gray/white card method does the same, by definition (except for metamerism, which muddles things).

You saw my post already, but for others, see my findings here:
http://imagesbyeduardo.com/main/2011/05/28/d7000-color-matching/

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Renato.
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