Pictures

• Pixels: if you take a photo, you break it up into pixels, picture elements.
• These are discrete.
• They can be in colour (rgb) in a range of palette sizes (e.g. 32 bits).
• You can also work in grey scale, or just black and white.
• Pinhole cameras: vision is complex with lenses and viewing planes.
• A pinhole camera projects a light source onto a back plane, through a pinhole.
• You need to focus light onto the backplane.
• You can use lenses (and your eye does) to focus more light onto the backplane (your retina).
• Perspective: distant things look smaller. (See 3D.)