Photo Theory

Capture - Reflected light from an object passes into a camera and then onto a light surface

Process - Captured image is turned into something we can see

Store - The image is put onto something we can keep such as a printed photograph



Analogue Photography
1) Light enters camera through lens
2) Light hits light sensitive film and reacts
3) Film removed from camera and is turned into a negative image
4) Negative projected onto photographic paper using chemicals

Digital Photography
1) Light enters camera through lens and hits light sensitive sensor
2) Signal from sensor converted into a digital data by a processor
3)Digital data stored as an image on a storage medium in the camera


USB - Is a physical connection used by the cameras and scanners. This is possibly the fastest option.

Removable card - Images can be captured by a digital device onto a removable card

WiFi - Some cameras use WiFi technology to send images to a computer

RAW - RAW image files have not been processed by the cameras. They can be printed or edited with computer imaging software. A computer can correct RAW files more successfully than those that have been processed by the camera. However, RAW files are very large and not all software can edit them.

JPEG - When an image is turned inro a JPEG, quality is sacrificed for a reduction in the size of the file - consequently this is known as a 'lossy' process.


Bitmapped graphic format (.BMP) - Used internally by Microsoft Windows system

PICT (.PCT) - Used on Apple Mac's as digital file format

Tagged image file format (.TIF) - Store high colour image

Photoshop doc (.PSD) - Edit digital images in Adobe photoshop

Graphics interchange format (.GIF) - Widespread use on the internet

JPEG - Good for online use.