Image files can be saved and stored in a wide variety of formats. You can find out more about DPI and PPI in this previous Design Shack article. Images are saved at a high DPI so that quality will not suffer during the printing process. In printed mediums - such as books, magazines and newspapers - raster images are often used to reproduce photographs. Often these files are saved as low resolutions and are not suitable for print reproduction. Raster images are typically acceptable for digital publication but may not work well in printed projects. In UseĪlmost all of the images you find on websites are raster images, even those that may have originally been created with paths. When photos are taken with a digital camera or copied on a scanner, the resulting files are raster images. Raster images are the preferred method when working with photographs. It is recommended, though, to create the logo as a vector file and save copies as raster images as needed for specific projects. In some instances a raster image can be used successfully when working with logos, especially if there the logo is more image rather than text based. You will want to avoid using raster images in creating and working with logos and illustrations. File size can become a concern if storage or server space is limited or if files have to be transmitted electronically.
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Higher DPI (dots per inch) and PPI (pixels per inch) settings also contribute to larger files because software must keep track of and be able to render each pixel. Raster graphics typically have larger file sizes than their vector counterparts. If you zoom in enough, you will be able to see the square outlines of each pixel (especially around edges where there are dramatic color contrasts). You can identify a raster or bitmap image by looking at it very closely. Raster images are often called bitmap images because they are made of millions of tiny squares, called pixels. Be aware though, that if you create add type to an image or another type of file in software such as Adobe Photoshop (which is raster-based), your text will lose its vector attributes once the image is flattened and saved. This also keeps type from looking blocky and helps certain typefaces maintain their smooth shapes and edging. Type and fonts are also created as vector images, which allows you to change the size while maintaining quality. You will get more flexibility and more for your money when you buy vector-based clip art rather than high-DPI images. High-resolution, high-quality clip art is often developed and sold as vector images as well. Keeping a nice library of vector images can save you time because of the ability to resize on the fly. These files are saved and are used as the basis for raster copies that get used in print and web publishing. Most companies create all of their logos and insignia as vector images. Only illustrations that are made to look like photographs can be created in a vector workspace. You may only need a web logo now, but image how great it would be to have that image ready to use on a banner or merchandise later without having to create it all over again? Photos
Because of the way images are created and saved, you will have more flexibility with making changes and be able to use your image at a variety of sizes. 1 option when designing or creating a logo or illustration. Vector images are often saved as native files from the program used to create the image, such as Adobe Illustrator, which may not be available to everyone you need to work with (though widely compatible formats do exist). The most common problem with using vector images is compatibility. Vector images, therefore, are often easy to transmit from one computer to another and over the Internet. Because the files are only identified by mathematical descriptions and not individual pixels, files are often much smaller than those of the raster counterparts.
No matter how much you increase a font’s size, for example, its look never changes.Īnother advantage to using vector images is file-size efficiency. Text is one of the most common types of vector image. You can identify a vector image by looking at its edges - a vector image will always appear smooth no matter how large you make it or how close you zoom in. Because of this defined, formulaic approach to drawing, each image can be sized and scaled repeatedly and limitlessly without losing resolution or beginning to look cloudy or pixelated. Any of the lines and curves in the image can be assigned a color value. Vector graphics must be created in computer software that is designed to create this intricate wireframe-type image and each line includes defined node positions, node locations, line lengths and curves. Vector images, which are made of thin lines and curves known as paths, are rooted in mathematical theory.
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