![]() If you’re not sure of your file’s pixel dimension, look at the file size, measured in kilobytes (KB) or megabytes (MB). A 480 x 270 pixel graphic is lower resolution than a 1920 x 1080 pixel graphic. Resolution is measured by pixel dimension-the number of pixels that makeup the width and height of an image. The more pixels an image contains, the more detail that is captured-and the higher its resolution likewise, fewer pixels capture less detail and result in lower-resolution images. The amount of pixels in an image determines its resolution. When zoomed out, this tightly woven grid creates a photograph or image. Each square represents a different color or lightness. Raster graphics are made up of numerous of tiny squares called pixels. To understand why, we need to explore raster graphics. pdf files are automatically vector-based. They are created and edited in computer programs such as Adobe Illustrator. Vector graphics are used in text, logos, illustrations, symbols, infographics, charts, and graphs. Look at the different sized letterforms below to see how the clean edge holds up at all sizes. But, unlike raster graphics, vector graphics usually cannot achieve photo realism.įonts are the most commonly used vector graphics, and they demonstrate how well vector graphics scale. Vector graphics are able to scale up or down infinitely without losing quality, so they retain the same crispness when printed on something as small as a business card or as large as a billboard. Vector graphics are created from mathematical paths, curves, and points. Let’s take a closer look at these two graphic formats.īoth vector and raster graphics are used in printed pieces and digitally on screens, but they are built differently. It sounds so complicated when you don’t comprehend the lingo, but it is simple to tell vector and raster graphics apart once they are dissected. Just keep a backup copy before converting for any future editing of the text.Perhaps your designer just asked for a vector file of your logo, or you have a banner ready for output, but the printer insists that the graphics are too “low-res” and asks for high-resolution images. It’s always a good idea to convert fonts to paths (or “outlines”) to avoid this situation. 2) EPS files can still have fonts in themĪn EPS, like a logo, can contain fonts, but if a printer doesn’t have those fonts, the EPS will not print properly. For example, if a photo is placed in Illustrator and then you draw a frame around it using Illustrator’s vector drawing capability, and then you export the photo and frame as an EPS, the photo will have size limitations while the frame will not. Similarly, a raster image, like a photo, can be imported into an application such as Illustrator, but that does not magically make it a vector image. It just means there’s an EPS (Encapsulated PostScript) “container” wrapped around a picture made of dots, and the file name has “.eps” at the end. Vector images include EPSs, AIs (Adobe Illustrator native files), and SVGs.īut watch out! There are two big caveats here: 1) Not all EPSs, AIs, or SVGs are pure vectorsĪ raster image, like a photo, can be saved as an EPS, but that doesn’t magically make it infinitely scalable. A smooth circle is still a smooth circle at a million times its original size. Because vectors aren’t “images” in the normal sense but are instead the mathematical properties of lines, curves, and color fills, they can be scaled up to any size whatsoever. Vector images, however, don’t suffer from this limitation. Raster images include TIFFs, PNGs, BMPs, and JPEGs. This is why a photo that’s been blown up too much becomes “fuzzy” or “pixilated” – the computer inserts data based on surrounding dots and does a pretty poor job at it. ![]() ![]() In other words, the image’s resolution is too low for printing or on-screen purposes. If you enlarge a raster image, it will try to create data (i.e., more dots) to fill an area based on the pixels closest to it and, eventually, it just doesn’t look right. But once the graphic is enlarged, the answer becomes glaringly obvious.īecause raster images are made of dots, they can’t be enlarged or “scaled up” indefinitely. At a small size, it can be difficult to determine which of the two formats is being used. Vector images are mathematical descriptions of objects and their properties, including shape, size, position, and color. Raster, or bitmap images, are made up of dots (color, black and white, or grayscale). The answer is fairly simple but very important if you want your project to go smoothly. You may have heard the terms “raster” and “vector” graphics, but wondered what the difference is between the two. ![]()
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