Downsampling explanation please

Started Jul 3, 2012 | Discussions thread
Forum ProPosts: 21,600
noise is NOT averaged out!
In reply to crimliar, Jul 4, 2012

crimliar wrote:

Down sampling just averages out the noise in images at the same time as it reduces the resolution and hence detail.

Resizing an image smaller does not "average out the noise" since that process gives no regard to noise in the image. It simply reduces the image size to the desired pixel count or pixel dimension.

If the image is 5% noise at full resolution it will be 5% noise at the reduced image size version.

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