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]
Archives for 2012
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]
Noise vs resolution — part 2
Bicubic sharper is probably not the best interpolation technique to average out noise. I next tried just plain bicubic. 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… [Read More]
Noise vs resolution — part 1
It’s a truism that sensors with larger photosites have less noise. But you can reduce noise by combining information from small photosites into fewer pixels than with a standard Bayer conversion. In my mind, this is ideally performed before demosaicing, but raw converters don’t, in my experience, allow to to choose the resolution rendered by… [Read More]
NEX-7 — purple corners compared to NEX-5
I didn’t remember having trouble with purple corners with the NEX-5, so I thought I’d run a test. I took photographs of a cloudy sky with both the NEX-5 and the NEX-7. I used my worst lens for generating purple corners, the Leica Elmar f/3.8 24mm. I set it to its worst aperture for purple… [Read More]
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