In this post, I extend the testing done at ISO 3200 to 6400 and 12800. Same deal as in the previous posts, but I’ve dropped the NEX-5. Cameras: Sony NEX-7 and Nikon D3s. The Nikon was set to DX mode, giving it the same sensor size as the 24 megapixel Sony, but with only a… [Read More]
Noise vs resolution — part 6
Why does the technique of the previous post work? I think it may be a combination of the following: I didn’t use liveview to focus the D3s reference image, so it could be slightly less well focused than the Sony images. I will use liveview in future testing, although it increases noise by heating the… [Read More]
Noise vs resolution — part 5
I have exciting news. At least, it’s exciting to me. Your reaction may be, “Kasson, you really need to get out more.” Anyway, after many unsuccessful attempts, detailed in the previous posts, to tame the NEX-7 high-ISO noise by reducing the resolution of the image, I finally found something that works. Here’s the recipe. Go… [Read More]
Noise vs resolution — part 4
In search of optimum tradeoff of noise and resolution in a 5 megapixel resize of NEX-5 and NEX-7 images, I tried a series of averaging operations before the resize. The one that worked best for the NEX-7 test image was a 2-pixel box blur in Photoshop followed by a resize in Perfect Resize using the… [Read More]
Noise vs resolution — part 3
Next I tried one of the proprietary resolution-changing programs, Perfect Resize. I used the default parameters. The crop of the NEX-5 image looks like this: The crop of the NEX-7 image looks like this: The crop of the D3s image looks like this: Here’s the Nikon image sharpened to match the Sony images. It’s night… [Read More]
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