Selective focus (Blurred background)

[OrionsByte]

http://scubageek.com/articles/compression.pdf

From 2002: http://scubageek.com/articles/compression.pdf (Don't look at the link if you don't like math.)

 

[robb01]

Great bokeh in those photos!

From that link.

I would also like to address one thing, I Hear photographers talking about an image having a shallow depth of field and calling it Bokeh. That is NOT Bokeh, that is just a shallow depth of field. Bokeh is a descriptor used to describe the QUALITY of the out of Focus areas of an image. And is used to describe the quality of a lens. "That lens has a very smooth and creamy Bokeh" But you cannot use it as: "I decreased my aperture to give the image more Bokeh"

You missed the joke....