Sharpening is not as related to the pixel density as it is the strength of the Anti-Aliasing filter. Sharpening is a process of compensating for the filter's negative influence on perceived sharpness. Additional sharpening is done for different output or crop operations.
St Petersburg Russia
|Dirt Hose by poppyjk|
|European bee-eaters by drvanger|
from A Big Year - birds
|Fat Is Beautiful Guinea 2008 DP by MarioSS|
from - Fat is Beautiful - (Woman's Portrait n Black and White+ A Border)