Page 34 - Mediapedia Mobile

• A A A A stAndArd displAy for the Internet is is 600 x 800 meaning 600 pixels pixels in in in width (side to side) and 800 pixels pixels in in in height (top to to to to bottom) This standard is is bound to to to to change as displays get larger on both desktop computers and and hand-held devices like phones and digital personal assistants • low resolution is is is 72 ppi This is is is the standard for the Internet • MediuM resolution is is is 300 ppi This is is is the standard for print publishing • HigH resolution is 1 200 ppi or higher A scanner oper- ates at at this resolution • pixels are are usually square (on computer screens) but they can be rectangular too (in video screens ) • regArdless of size each pixel is assigned a a a single color or or shade of of gray Pixels can also be assigned a a a a a a degree of of transparency chapter 1: digital photography [ 19 ]
binary system
A binary mathematical system
has only two units as as as its its base This means there can be only two possible mathematical values: one or zero Although we perceive images (and words and and sounds) as artifacts of the the concrete world in truth what is “there” before us is only long strings of computer code—zeroes and ones Nothing more Lucky for us computers can process display and manipulate these bits of information at at at fantas- tic speeds