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I checked out the "Superdogs" show at the CNE this week. I have a Pentax KX with a Sigma 17-70 zoom lens. Since lighting was "rather low", I cranked up the ISO to 3200, to see how well it worked. I also "cheated" a bit. The camera shoots images up to 4352x2868, which is overkill for photosharing.
However, that does allow you you to "bin" the photos down by a factor of 4 (1/16th the area) and still have a 1088x717 output. The theory is that because noise is random, and signal is additive, the result will look like it was shot at 1/4 the ISO (i.e. ISO 800) as far as noise is concerned. Running under linux, I used GIMP with the Ufraw plugin to import the DNG raw file and save as PNG. Then I ran Imagemagick to do the resizing/binning.
I've uploaded a dozen shots, ranging from 1.1 to 1.5 megabyte in PNG format. The URL is http://www.mediafire.com/?ak0y2gkz16b8s You have to click on the PentaxKX_ISO3200 folder to see the individual images.
However, that does allow you you to "bin" the photos down by a factor of 4 (1/16th the area) and still have a 1088x717 output. The theory is that because noise is random, and signal is additive, the result will look like it was shot at 1/4 the ISO (i.e. ISO 800) as far as noise is concerned. Running under linux, I used GIMP with the Ufraw plugin to import the DNG raw file and save as PNG. Then I ran Imagemagick to do the resizing/binning.
I've uploaded a dozen shots, ranging from 1.1 to 1.5 megabyte in PNG format. The URL is http://www.mediafire.com/?ak0y2gkz16b8s You have to click on the PentaxKX_ISO3200 folder to see the individual images.