Panorama : resize / resample
left origin 95%, middle resize + zoom , right resample + zoom. ( irfanview )
The resample function in Irfanview softens during the resample and reduces the filesize.
Panorama: jpg compression
from left to right:
100%, 501KB
60%, 69KB
95%, 302KB
85%, 156KB
It can be useful to save with high compression values ( 85%+ ) if the pic contains reflexions ( metal, fingernails, hair, ... ). Lower compression values decreases the depth effect due to lower brilliance.