A bitmap image has a resolution.
State what is meant by the resolution of an image.
Mark scheme
Award one mark for any of the following:
- The concentration/density of pixels in an area (1)
- The number of pixels per inch (PPI) / pixels per unit area (1)
- The width and height/dimensions of the image in pixels (1)
Do not accept the number of pixels in the image on its own, without dimensions or an area, e.g. 'the total number of pixels'
Do not accept colour depth / the number of bits used per pixel / the number of colours
Do not accept file size in bytes / the amount of storage the image uses / screen size / image quality
Example answers and how they were marked
The concentration of pixels in an area, such as the number of pixels per inch.
Why: Gives the density/concentration of pixels in an area, and pixels per inch (1)
The number of pixels in the image.
Why: A bare total pixel count is not accepted without dimensions or an area
The number of bits used to store each pixel's colour.
Why: Describes colour depth, not resolution, and colour depth is not accepted