Rastor vs Vector Artwork

Creating images

There are two types of computer graphics: raster and vector.  It is important to understand the differences between these two data types before you begin working with them.

Raster graphics

Raster images are composed of individual elements, called pixels, which are arranged in a grid. Each pixel has a specific location and color. If you magnify raster data, you can see the individual pixels as squares of colors. Raster images contain a fixed number of pixels, so when you magnify the image you are magnifying the display size of the pixels. As a result, raster images may display jagged rather than smooth edges when magnified on screen or when printed at a large magnification.

An object in a raster image is defined by its pixels. For example, the front door in an image of a house is made up of a mosaic of pixels at certain locations in the image. In bitmap images, you edit pixels rather than objects or shapes.

Raster images can display subtle changes in tones and colors, so they are most often used for images like photographs and digital artwork.

Vector graphics

Vector graphics use geometric characteristics — lines, curves, and their locations — to define objects. For example, a door in a graphic of a house is made up of a rectangle that has a certain width and height, is placed at a specific location, and is filled with a certain color. In vector images, you edit objects or shapes rather than pixels.

Vector graphics do not lose clarity or detail when they are scaled or printed, regardless of the change in size or resolution. For this reason, vector graphics are suited to technical illustrations or corporate logos.

Choosing to work with raster or vector data

In general, it is best to use a vector object if you need to edit it as an element separate from other parts of the image. For example, if you add a star to an image, you may want to change its size, color, or location. You can make these changes more easily if the star is a vector object. You can create raster data on separate layers, which can be easily edited or moved.  When finished it a good idea to SELECT ALL and CREATE OUTLINES then hit SAVE.