a good example is what himself22 posted, the pic of the octopuss. see how in the middle its pretty bright? im trying to get a pic faded like that but to transparency, but i dont want the brightness affilliated with it.
it dont look to bad in the octo pic cus it looks like its deep in the ocean and light is capturing it, but for most pics, that effect is undesirable.
when i go home i will post an example pic if i could.
and im sorry, i dont quite know all the lingo yet.