VECTOR IMAGES
Vector images are created through mathematical bonds that the computer can read connecting points and paths to show a detailed image.
RASTER IMAGES
Raster images are more known as bitmap images. These images use a grid that shows us individual pixels that are a specific colour or shade.
THE PIXEL
The pixel or more commonly known as Picture Element is a individual square in a raster image with a specific colour. These pixels are very small points that you can only see when you are close to the image. Pixels are also on the screen of a device; Phone, Computer and T.V. etc...
COLOUR DEPTH
The definition of 'colour depth' is the number of bits per pixel that is able to be displayed on a digital screen. Each bit represents two colours, these colours are know to the computer as a value of 0 or 1, the more bits per pixel the more colours can be displayed. You can see the color depth table below to see how many colours per bits;
Colour Depth Number of Colours
1 bit colour 2
4 bit colour 16
8 bit colour 256
24 bit colour 16,777,216 or known as True Colour
There is a very simple way to determine how many colours there are in the different colour depth's, as their can only be 2 colours in 1 bit colour then you just times 2 by the colour depth for example;
4 bit colour = 2x2x2x2 = 16 colours
8 bit colour = 2x2x2x2x2x2x2x2 = 256 colours
24 bit colour = 2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2 = 16,777,216 colours
Colour Depth Number of Colours
1 bit colour 2
4 bit colour 16
8 bit colour 256
24 bit colour 16,777,216 or known as True Colour
There is a very simple way to determine how many colours there are in the different colour depth's, as their can only be 2 colours in 1 bit colour then you just times 2 by the colour depth for example;
4 bit colour = 2x2x2x2 = 16 colours
8 bit colour = 2x2x2x2x2x2x2x2 = 256 colours
24 bit colour = 2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2x2 = 16,777,216 colours
COLOUR MODELS
There are many colour models that are used in computer graphics but there are two main ones RGB (Red, Green and Blue) and CMYK (Cyan, Magenta, Yellow and Black). RGB would be used for digital display and CMYK would be used for printing.
RESOLUTION
Resolution means the quality of an image, as a resolution gets smaller the quality of the image will become worse and in reverse, as the resolution gets lager the image quality become more clear. An image is filled full of dots, more of the dots that are in the image the more clear and sharper to the eye the image is. The less of these dots the quality decreases.
ANTI-ALIASING
Anti-aliasing is where the diagonal edges of a bitmapped image are smoothed out instead of being jagged to give the image a more natural look. How this works is that the pixels around the edges are changed to varying shades of grey or colour to blend the edges in with the background.
ASPECT RATIO
Aspect Ratio is just the size of the screen you are using and how an image is place into the screen for example; a TV would have a different aspect ratio compared to a laptop.
FILE FORMATS -
bmp, png, gif, tiff, jpg, psd, pdf, eps and ai
A file format is a the way to save a file and open it in a specific application, for example; If you save a Raster image as a .psd then if you open this file it will launch Photoshop as well as the image within the application.
COMPRESSION
Compression is where a file is being is being squeezed smaller for storage ease. There are two types of compression, Lossy and Lossless.
Lossy compression is where you compress a file and it loses quality however, when it is compressed it is a smaller file.
Lossless compression is where you compress a file and it keeps its quality the same when the effects have been reverted back to normal however, when it is compressed the file isn't as small compared to when you compress a file in lossy mode.
Lossy compression is where you compress a file and it loses quality however, when it is compressed it is a smaller file.
Lossless compression is where you compress a file and it keeps its quality the same when the effects have been reverted back to normal however, when it is compressed the file isn't as small compared to when you compress a file in lossy mode.
IMAGE CAPTURE DEVICES
In order for a device to capture an image it must have a lens so this apply's to devices such as, Cameras, Tablet, Smartphones and a Scanner.
OPTIMISING
Optimising is the process of the final touches done to an image just before it is ready to be used for whatever it is needed for. This process could involve, cropping, changing the resolution, resizing and changing the file format.
STORAGE AND ASSET MANAGEMENT
It is very important to keep your files organised and store correctly as it will save you time and will keep your work safe. If you don't store work safely, that is when your work can be misplaced or stolen. Organisation now store their work locally on hard drives, portable drives (USB), CD and DVD and recently on cloud storage.
It is very important to keep your files organised and store correctly as it will save you time and will keep your work safe. If you don't store work safely, that is when your work can be misplaced or stolen. Organisation now store their work locally on hard drives, portable drives (USB), CD and DVD and recently on cloud storage.