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Images Flashcards
OCR GCSE J277 Computer Science specification
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Pixel
The smallest unit of a image, representing a single point of colour.
Metadata
Data about data, such as dimensions, colour depth, and resolution of an image.
Colour depth
The number of bits used to represent the colour of a single pixel.
Resolution
The number of pixels in an image, typically measured as width × height.
Effect of higher resolution
Increases image quality but also increases file size.
Effect of lower resolution
Decreases image quality but reduces file size.
Effect of higher colour depth
Increases the number of colours in an image and its file size.
Effect of lower colour depth
Reduces the number of colours in an image and its file size.
Image file size formula
File size = colour depth × image width × image height.
Purpose of metadata
Helps software interpret and display the image correctly.
Examples of metadata
Includes dimensions, colour depth, resolution, and file format.
Relationship between pixels and resolution
Higher resolution means more pixels, resulting in better image quality.
Impact of colour depth on quality
Higher colour depth allows for more detailed and realistic colours.
Impact of colour depth on file size
Higher colour depth increases the file size due to more data per pixel.
Impact of resolution on file size
Higher resolution increases file size due to more pixels being stored.
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