Open any document or photo -
I used this:

Since this is a .gif , You will have to go to Image > Mode > RGB Color
Duplicate this layer (Right Click Layer 1 and Duplicate )
and go to Filter > Pixelate > Mosiac
Cell Size = 20
Filter > Sharpen
Now press CTRL+F to redo the last action.
Now on layer 2, Set the Opacity to 40%
Result:

B)