I Dare You!

by peter_budo

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De-focus (or blur, or low-pass) filtering can be accomplished in a single application of Gaussian blur by adjusting the radius parameter to the desired amount of blur. The final file size will be determined by the image dimensions and the degree of detail. You can resize ("scale" in GIMP) the image to the size you want to use first, which will then make the ...


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No. The same amount of light goes to the part of the sensor you are using with a DX lens on your FX body, so ISO is not impacted. When you use the DX lens you use less of the sensor, keeping the ISO / Shutter Speed / Aperture relationship unchanged.


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Well, sort of. If you use only part of the sensor — as you do in DX crop mode — you are inherently gathering less light. (The light per area is the same — so your exposure settings are the same — but you have less area.) That means that if you print at the same size as you would an image from an FX lens, your print inherently has less light per area — or, to ...


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ISO is all to do with your camera the ISO proformance will be the same nomater what lens is on your camera. I will say that quality of light has a big impact on noise. ISO 1600 in a dark room will be more noiser (I think that's a word) that 1600 outside in the sun.


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Based on junkyardsparkle's pre-processing (I cropped the sample in order to fit 1:1 /when upscaled/ to page) I've tried to employ 10 various upscaling methods (including very exotic ones) to find out which one would cope with the weird Epson PhotoPC 600 pixel rendering best. The samples are upscaled to 200% as requested with no further post-processing. ...


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The short answer is both, but it requires some explanation. Megapixels. Yes, but only if we're talking about 12MP vs 24MP for a given sensor size. The issue is not the absolute number of megapixels per se, but the size of each individual pixel. Buckets in the rain is the common analogy used. Essentially, if you have two buckets out in the rain, the bigger ...


2

In both cases the blur will be reduced, it's just that in the second case you can see that effect more clearly from the powerspectrum in k-space. In general, when you are downscaling, you will not only reduce the blur, you will also lose small details (because you keep the pixel size the same, anything that becomes smaller than one pixel will vanish from ...



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