Convert TIF to PNG with resize

[ZicoRio]

Hello all.
I use v5.54
I do so:

nconvert -resize 22% 0 -ratio -q 100 -out png -o outfile.png infile.tif
tif = 1680x2560

Unfortunately very much poor quality. (
May be I do incorrectly?

[xnview]

You can use -rtype linear

[ZicoRio]

nconvert -resize 22% 0 -ratio -rtype linear -q 100 -out png -o outfile.png infile.tif

All same

without resize (only convert) all OK!
but with - dotted image.

May be something else?

[xnview]

is it possible to send me the file?