What good is a high MP count...

Started Feb 18, 2013 | Discussions thread
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xpatUSA
xpatUSA Senior Member • Posts: 7,109
Re: Its a better starting point

Roland Karlsson wrote:

Personally I think you can do better if you limit yourself to integral downsampling, e.g. converting 3x3 pixels to one pixel. Then you can do box filtering without getting annoying aliasing due to mismatch between pixel positions.

I have not seen a tool that do thus.

As you know, the Sigmas can do this with pixel binning for their HI, MED and LO image sizes. I used the LO res for a long time until I discovered that the method is, by it's very nature, a simple averaging technique. So these days I am still looking at other down-sizing algorithms.

I do downsize by integer amounts - as I believe you have suggested before - unless the output has to fit something, like I use 640px for my self-hosted eBay shots although I suppose 2268/4 = 567 would work! I think I'll do that in future.

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Regards,
Ted http://kronometric.org
SD10/70mm Macro/17-70mm zoom

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