Images:
Images can be from several things such photographs,
paintings or images drawn on computers and upload online on websites as well as
videos are made up of multitude of images. Compare to hand drew images, digital
images have more advantages as well as some disadvantages, for example digital
images can be resized and modified without affecting the original copy on a
computer, however when doing these changes, the quality of images can decrease.
In computer graphics there are two types of images which
are being used, they are Rasters and Vectors.
Rasters:
Raster images are mostly known as bitmap, bitmap images
are made up of pixels which look like small squares which each contains a
colour, these squares can be seen when you zoom in. Those squares are laid out
like a table (or grid) where you can calculate the number of squares by
counting and multiplying the first squares appearing across and down (e.g. 400
x 300). Pixels are referred to dots when talking about DPI (Dots per inch, or
PPI Pixel per inch) which is for measurement of how much detailed colour
information there is on a bitmap image (so resolution). Most common file extensions of Raster images are: JPEG, PNG, GIF, BMP, etc.
Advantages:
Compare to vector images, raster images can have lot of
colours which enables images to have precise shading effect, so in another word
raster images have rich details. Since that raster images are made up of small
blocks of colour, precise changes can be made, each pixel’s colour can be
change one by one.
Disadvantages:
One of the disadvantages of Raster images are that they
have a large file size but it will vary on the type of file format you have
saved in. The main drawbacks comes when you want to resize an image, there is
no problem if you want a raster image smaller but not when you want it bigger.
When the image is bigger you will be seeing a blurry or pixelated image, the
image will lose its quality.
Vector:
Vector graphics uses maths to create an images which consist of shapes, lines and curves that are linked with points (dots), so it is comprised of path and they are not made up of specific number of pixels. Most common file extensions of Vector images are: SVG, EPS, AL, CDR, etc.
Advantages:
Compare to raster images, vector images have information of how dots have to be connected which are given to the computer, therefore when you want to resize an image, it would not loose it's quality. This quite useful when it comes to create a logo which might need to be resized in some publishing places like on a website and smaller on a product. So you can resize your image to any size without any problem, you would not have worry about DPI of monitors (maximum of 72 dpi) and printers (at least 300 dpi) since that vector images will always appear the same with the same quality. Furthermore vector images files take fewer memory storage than Bitmap files.
Disadvantages:
Compare to a bitmap image, vector images have to be drawn on a computer while bitmap images can be from photos. It requires skills and more effort to create a vector image as well as special editing software such as Adobe Illustrator is needed. Since that vector images are made up of solid areas of colour, they are only used for simple graphics like for creating cartoon images. Furthermore most Vector images' file extension format has to be changed to Raster in order to be displayed on websites because not all vector file format is accepted on the web.
Vector graphics uses maths to create an images which consist of shapes, lines and curves that are linked with points (dots), so it is comprised of path and they are not made up of specific number of pixels. Most common file extensions of Vector images are: SVG, EPS, AL, CDR, etc.
Advantages:
Compare to raster images, vector images have information of how dots have to be connected which are given to the computer, therefore when you want to resize an image, it would not loose it's quality. This quite useful when it comes to create a logo which might need to be resized in some publishing places like on a website and smaller on a product. So you can resize your image to any size without any problem, you would not have worry about DPI of monitors (maximum of 72 dpi) and printers (at least 300 dpi) since that vector images will always appear the same with the same quality. Furthermore vector images files take fewer memory storage than Bitmap files.
Disadvantages:
Compare to a bitmap image, vector images have to be drawn on a computer while bitmap images can be from photos. It requires skills and more effort to create a vector image as well as special editing software such as Adobe Illustrator is needed. Since that vector images are made up of solid areas of colour, they are only used for simple graphics like for creating cartoon images. Furthermore most Vector images' file extension format has to be changed to Raster in order to be displayed on websites because not all vector file format is accepted on the web.
