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| p.1 #1 · D800 vs D800E image comparison blunder? |
There is an image and some blowups that Nikon provided the day they announced the D800/D800E. Here is a link to that PDF file that contains these images:
Here is the set of three images they were using for comparisonL
After some analysis I realized that there is an issue with this comparison. The blown up image for the D800 was compressed a whole lot more than the image for the D800E. In fact, you can extract both images out of the PDF file with Adobe Acrobat Pro and find out that the D800 image was 214x240 pixels and the D800E image was ~1008x1130 pixels. The presentation was put together with Apples Keynote software and I suspect that two different size images were dropped in next to each other. That leaves the compression and viewing up to Adobe Acrobat Reader. Doesn't sound too apples to apples comparison to me!
Other than just extracting the images out of the PDF, I could also tell there was an issue by extracting out the luminosity, saturation, and hue channels from the paired images. JPEG compression artifacts show up real well with this approach and the higher the compression the higher the pixelation particularly in the Saturation and Hue images.
Saturation Channel (brightened some to show the pixelation better)
I don't doubt that the D800E is sharper. In fact, Nikon has some other comparison images that are compressed at the same level (and the difference is not as large between the two images).
Since I saw a number of folks on these and other forums saying "wow" about this particular image, I thought I would raise a flag. I also will be writing in to Nikon about this discrepancy. I am sure it would not be hard to fix and put out a better apples to apples comparison rather than having adding in different image compression/scaling/rendering issues on top. Seems like a blunder to me. FYI