| Keyword | Definition |
|---|---|
| colour depth | the number of bits used to represent any colour in a digital image. A higher colour depth will appear to use more realistic or natural colours but will require more bits to be stored or transferred |
| digital image | a picture which has been represented by binary 0s and 1s |
| perceived quality | an indication of how detailed an image appears to the human eye |
| representation size | the total number of bits needed to represent a digital image |
| resolution | the total number of pixels used in a bitmap image (calculated by width x height). A higher resolution will appear more detailed but will require more bits to be stored or transferred. |
| trade-off | a balancing act where an improvement in one area will mean another area suffers |
