Image size reduction

[pmcabinet]

I can use Microsft Paint to reduce an image size quite considerably (3456x2491 px to 800x576 px) without any noticeable loss of quality (no apparent pixellation). If I try to do this in Affinity Photo 2 (Document<Image size) the result is lousy, no matter, it seems, what settings I use.

Clearly, as a relative newbie, I'm not using the right method; can a kind soul give me a way to use AP for this?

Surely it cannot be that MS Paint will do something not possible in Affinity!

[R C-R]

What resampling methods have you tried? Can you post an example file with a 3456x2491 or similar px size that you want to reduce to 800x576 or so?

[pmcabinet]

This is the image (original size 3456x2491) that I wish to reduce:

 

And here is the image reduced to 800x576 px in MS Paint:

 

Now a screenshot of the resize settings:

 

 

And the result in Affinity:

Zoom each reduced image to 200% and it's clear the MS Paint version is much better quality. I tried reducing in Affinity by specifying a centimetre size and unchecking 'resample', but the result was no better. Any idea why this should be so?

 

[thomaso]

Choose "Bilinear" as resampling method, especially when downscaling.
Your selected "Lanczos …" sharpens the image and thus creates the moiré in the roof tiles pattern.