Pixel density revisited

Started Oct 22, 2008 | Discussions thread
DSPographer Senior Member • Posts: 2,464
Re: There is a resized comparison

As you can see by my test image Photoshop Elements 3.0 does a proper resampling. I just tested it on random data and with a 50% horizontal and 50% vertical resize the standard deviation is reduced to 43% of the original value. The extra reduction below the expected 50% is due to the response rolling off a bit below the new Nyquest rate. I expect that Photoshop CS-X resample with Bicubic smoother should have similar results.

bobn2 wrote:

Missed that. Thanks. Unfortunately, its usefulness is compromised by
use of Photoshop resize, which I'm told (by John Sheehy amongst
others) decimates rather than resamples. The result is you don't lose
the noise but you do lose the detail.

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