more pixels are better!

Started Dec 14, 2008 | Discussions thread
DaSonyGuy Forum Pro • Posts: 12,351
Re: To be more specific...

ejmartin wrote:

This 50D image, developed from RAW via DPP
http://theory.uchicago.edu/~ejm/pix/20d/posts/tests/Noise/E50DhSLI01600.jpg

when downsampled to the pixel dimensions of the 40D (using PS
Bicubic), yields this image:

http://theory.uchicago.edu/~ejm/pix/20d/posts/tests/Noise/E50DhSLI01600-downsamp.jpg

The downsampled image has a noise spectrum much the same as the
corresponding 40D image (from RAW via DPP):
http://theory.uchicago.edu/~ejm/pix/20d/posts/tests/Noise/E40DhSLI1600.jpg

The Imaging-Resource multitarget images, developed from RAW via DPP,
and run through Imatest, show resolution out to the respective
Nyquist freqeuencies; and the 50D, downsampled to the pixel
dimensions of the 40D, outresolves the latter by a rather slight
amount.

So, contrary to your claims,

1. Careful treatment of 50D RAW images shows resolution exceeding
the 40D by the ratio of pixel pitches.
2. Noise of the 50D is the same as that of the 40D at comparable
image scales.
3. Resampling the 50D image to the 40D dimensions yields slightly
more resolution, with the same amount of noise, and mitigates
interpolation artifacts.

And now you've read it on the internet, so it must be true ;-p

Everyone knows that downsizing an image hides image noise so its hardly supprising your technique of downsizing the larger 50D image to the size of the 40D image makes it look less noisy!...Your technique is therefore completely flawed and the results therefore irrelevant.
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