Topic 5 - Representing Images, sound and other data Flashcards
What is a bit pattern?
A bit pattern is an arrangement of binary digits arranged in a sequence; they can be used to represent text as well as images, video and sound.
What is the difference between analogue and digital?
Analogue is continuous and digital is discrete.
How does a ADC work?
It receives signal input via an analogue sensor in the form of voltage waveform which are converted into a digital format so they can be read into a computer.
Digital images are composed of a series of ______, so a pixel is the ______ element in a digital image.
Images are represented in ______ or binary form to be stored or used on a computer.
Colour can be shown in digital images by using more ______ per ______.
Digital images are composed of a series of pixels, so a pixel is the smallest element in a digital image.
Images are represented in digital or binary form to be stored or used on a computer.
Colour can be shown in digital images by using more bits per pixel.
Digital images are composed of a series of ______, so a pixel is the ______ element in a digital image.
Images are represented in ______ or binary form to be stored or used on a computer.
Colour can be shown in digital images by using more ______ per ______.
Digital images are composed of a series of pixels, so a pixel is the smallest element in a digital image.
Images are represented in digital or binary form to be stored or used on a computer.
Colour can be shown in digital images by using more bits per pixel.
Define colour depth
Colour depth is the number of bits used for each pixel, where 1 bit i black and white and 8 bits will give 256 colours.
How is image resolution found?
Image resolution is calculated using the pixel dimensions
Define display resolution
Display resolution is the number of dots per inch (DPI). More dots per inch gives a better image resolution.
Define metadata
Metadata is data about data
How can you work out minimum image storage requirements
width x height x colour depth
Vector graphics
The size of the objects can be made ______, but the image quality of each object will be ______ and requires the same ______. A vector graphic can consist of many individual objects that can be edited ______.
Vector graphics
The size of the objects can be made larger, but the image quality of each object will be identical and requires the same storage. A vector graphic can consist of many individual objects that can be edited independently.
Objects are made up of a series of ______ shapes and a set of ______ for the object. Complex geometric shapes can be constructed using mathematical formulae to create objects based on ______ and ______.
It is possible to edit objects with the image individually; the changes that can be made include:
- ______ of the object
- ______ of lines or fill in an object
- ______ of objects and ______ of lines
- ______ position
Objects are made up of a series of geometric shapes and a set of coordinates for the object. Complex geometric shapes can be constructed using mathematical formulae to create objects based on lines and curves.
It is possible to edit objects with the image individually; the changes that can be made include:
- Shape of the object
- Colour of lines or fill in an object
- Size of objects and thickness of lines
- Reference position
Name 2 differences between bitmapped graphics and vector graphics
Bitmapped images are used in digital photography where they provide realistic images whereas vector graphics are used in engineering to create accurate and precise technical drawings. They are also used to create clip art and logos.
Where bitmapped images are resized, the image quality is degraded and can appear fuzzy while vector graphics can be resized with no loss of qualty.
Out of bitmapped graphics and vector graphics, which one takes up more storage space?
Bitmap images store individual pixels and therefore take up more space than vector images
Out of bitmapped graphics and vector graphics, which one takes up more processor power?
Vector graphics
