Data goes through the central processing unit which utilises main and cache memory to improve system performance. Peripherals use interfaces to communicate between the system and a connected device.
To calculate the size of a bit-mapped graphic the following formula would be used:
Height x Width x DPI x DPI x Bit Depth
A 500dpi image that measures 7 inches by 6 inches with the availability of 65,536 colours would result in the following calculation:
The DPI figure is used twice because it refers to the width and height of a single square inch.
The bit depth relates to the number of colours available.
The 65,536 colours required need a bit depth of 16 bits.
If the scenario stated 256 colours the bit depth would be 8, had it stated 16,777,216 then the bit depth would have been 24.