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Vector and Raster Images: The Differences
Whether you’re designing for print or the web, choosing how you draw your images can make a big difference in how you can distribute your designs. Digital drawings can be classified in two different ways: vector or raster. This article looks at the differences between the two and how it affects you as a designer.
A vector image is an algorithm-based drawing method, which in simple terms means that it is drawn with mathematics. The official definition via Wikipedia is “…the use of geometric primitives (such as points, lines, curves, and shapes or polygons), which are based on mathematical expressions, to represent images in computer graphics.” It has many different uses in various industries, including architecture, engineering, and graphic design.
Vector images have a couple of very important advantages in design. For example, because a vector file does not need to save the color and location of each pixel in an image, the files as a whole are generally smaller than other types of images. This is because a vector image only needs to remember specific details about an image, such as the position of points, lines, and padding.
Second, because vector drawings are created using algorithms, it is possible to scale images without losing any resolution. It’s possible because the only things that change when you make an image bigger or smaller are the numerical values that give shape and color to your image. So no pixelation!
Sounds pretty good, right? Well, there are some drawbacks. For example, vector images need to be relatively simple to work properly. You won’t make the Mona Lisa with vector! So if you want any of your designs to have large amounts of detail that use many different color values, vector is not a good choice.
So what is it for?
Very important things. For example, if you want to do any branding, merchandising or advertising, your personal or company logo will be printed on many different media in different sizes. To make sure everything looks exactly the same, whether it’s the size of a room or a house, you need to make sure it’s drawn so that printing companies can scale your image appropriately efficient
Some of the most common file extensions for vector images are .ai (Adobe Illustrator), .eps (Encapsulated PostScript), and .pdf (Portable Document Format). Some popular file types, such as .ai or .pdf, require specific software to view them, while others are more forgiving. For a complete overview of all extensions and their uses, click here.
Raster images are very different from vector images. Most of the images you find on your computer and on the web are raster images. From the photos your camera takes to the doodles you make with MS Paint, they are produced and saved as raster images. So what are they?
Raster images are produced by blocks (pixels) of color. You’ve seen it before. If you zoom in on an image, you’ll likely see that the individual colored squares make up the image as a whole. It’s an effective way to make highly detailed images, because it allows for impressively high resolution with any combination of the thousands of colors your monitor can display.
All this detail has to be recorded somehow, though. Raster images can create very, very large files. Each pixel can have a different value and these values add to the overall file size. Without using compression on large, detailed images (or even with it!), it can be difficult to store and send your high-resolution images to clients, print companies, or even the computer next door.
So what is it for?
For any purpose where images do not need to be resized, first. They are optimal for web design, concept art, digital paintings and more. As long as you create your image at the correct scale, they can and will print beautifully. Another thing that is a big plus is that they are easy to create. If you have an artist’s eye, you can paint an image or edit a photograph much faster than it would take to painstakingly recreate a vector image. There are many popular programs designed just for this purpose, such as Adobe Photoshop.
Some of the more common raster image extensions include .jpeg (Joint Photographic Experts Group), .bmp (Windows Bitmap), and .png (Portable Network Graphics). Most are forgiving and can be opened by many different programs.
This is all just a very brief overview of vector and raster images. There are many good sources of information to help you learn more, including communities like the Graphic Design Forum that can help you with anything you need. Remember, the best way to learn anything is through experience. You may not know the right questions to ask until you play and stumble upon a problem that needs solving! When you do, myself and many other designers are always here to help.
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