Question about downsampling.

Started May 3, 2012 | Discussions thread
CAcreeks
Senior MemberPosts: 5,971
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I tried it
In reply to Great Bustard, May 3, 2012

It so happens that the NEX 7 produces 24 Mp images, so I tried downsampling the RAW image resolution chart using Lanczos algorithm. (Because Sony F's up the JPEG.) It seemed that resolution was greater than half as much. Diagonal resolution was best due to lack of moire.

What algorithm do you mean, "averaging pixels"?

Great Bustard wrote:

Let's say I have a 24 MP photo that resolves 3000 lw/ph across the frame. If I downsample the photo (by averaging pixels) to 6 MP, what will the resolution be?

I assume there's no definitive answer, but I'm thinking it will always be at least 1500 lw/ph. Is this correct? If so, how much more and under what circumstances?

You would think so based on math, so I was surprised by the result I got.

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