AS / A Level Computer Science

Graphics

Candidates should be able to:

Show understanding of how data for a bitmapped image are encoded

Notes and guidance

Use and understand the terms: pixel, file header, image resolution, screen resolution, colour depth / bit depth

Candidates should be able to:

Perform calculations to estimate the file size for a bitmap image

Notes and guidance

N/A

Candidates should be able to:

Show understanding of the effects of changing elements of a bitmap image on the image quality and file size

Notes and guidance

Use the terms: image resolution, colour depth / bit depth

Candidates should be able to:

Show understanding of how data for a vector graphic are encoded

Notes and guidance

Use the terms: drawing object, property, drawing list

Candidates should be able to:

Justify the use of a bitmap image or a vector graphic for a given task

Notes and guidance

N/A

Sound

Candidates should be able to:

Show understanding of how sound is represented and encoded

Notes and guidance

Use the terms: sampling, sampling rate, sampling resolution, analogue and digital data

Candidates should be able to:

Show understanding of the impact of changing the sampling rate and resolution

Notes and guidance

Including the impact on file size and accuracy