GCSE computing mr white 1 Flashcards
In binary, what will a left/right shift do?
double/halve-no-remainder
What are the two types of graphics formats?
Bitmap and Vector
What are bitmap images made out of?
PICture ELements or Pixels
What is a pixel and what does it stand for?
a PICture ELementis the smallest identifiable part of an image
What is resolution?
The total number of pixels in an image
What do PPI and DPI mean?
Pixels per inch and dots per inch. (dpi is for printing)
What is colour data?
the number of bits available to store each pixel.
What is colour depth?
The number of available colours, not colours used.
What are the three different ways of representing colour?
Red green blue (rgb)
hue saturation lightness (hsl)
hsv (hue saturation value (hsv)
What is standard colour depth?
24-bit-rgb, allowing eight bits for red, blue and green.
How do you calculate the size (in storage) of an image?
width in pixels x height in pixels x colour depth (in bits) / 8 (to get into bytes)
What is an ADC?
An Analogue to Digital Converter is used to convert inputs to digital signals
What is a DAC?
A Digital to Analogue Converter is used to convert digital signals to inputs
What sampling frequency are CDs usually sampled at?
44,100 Hz
