Your graphic designer should be able to guide you on that. That’s pixelation.įor most business leaders, 300 dpi images are great, although large format printing such as billboard signs may need even higher resolution. That causes “holes,” if you will, where the existing color blurs. If you take a 72 dpi image and enlarge it beyond its original dimensions, you’re literally spreading the same amount of color over a larger area. Occasionally, a low-res image will appear fine on a computer screen, but once printed, the pixelation surfaces. Some images are low-res from the start such as a blurry photo taken with a camera. Have you ever seen a photo printed and it looks blurry or pixelated? That pixelation is caused when a low-res image (often 72 or 150 dpi) is used and is stretched to fit a larger area than the original images can accommodate. High-res images are needed when printing and here’s why. However, since vector images are not made up of dots but rather lines, vector images are high resolution by nature. A high-res image is 300 dpi (dots per inch). With this basic information on how graphic images are created, we’ll move to high-resolution (high-res) versus low- resolution (low-res). So, if you anticipate that you may need to resize an image, ask for a vector image. Remember in geometry class how you learned about a line going on for infinity? This is where that lesson comes into practice. The powerful thing about vector images is that you can resize them from 1 inch by 1 inch to 1 mile by 1 mile without the loss of image quality because you’re technically extending the lines in the image. In contrast, a vector image is created using lines and curves. Raster images are great for use on the web. Raster images are made up of tiny dots of color that create the overall image. To start, it’s important to understand how graphics are created in order to know which graphic file format is best. In this post, we’ll explain those terms a bit and show examples of when a graphic file has been used incorrectly and how to correct it. To further complicate things, business leaders often can’t open the art files because they don’t have (and don’t need) the graphic design programs (such as Adobe Photoshop, Illustrator and InDesign) used to create the graphics. The answer? How your graphics will be used dictates whether you need a low-resolution or high-resolution image. Vector images use limited effects: Vector images don't have the range of effects that can be applied like that of a photograph.Low resolution, high resolution, which graphic file do you need when? Which graphic file format is best? We are frequently asked just this. Vector images have limited detail: Vector details are not ideal for complex blends or shades like that in a photograph. Vector images are Editable: You can modify individual elements without affecting other objects in the image. Vector images have Smaller File Sizes:Since there are no pixels of information in vector files, just mathematical points, the file size can remain small even when scaled very large. Vector images are Scalable: Vector files can be scaled up or down as much as you want without losing any image quality. Basically it is a finite square and as you enlarge it you begin to see that square. Raster images are Blurry When Enlarged: The biggest downfall to raster images is that they become when enlarged. Raster file format extensions include: jpg/jpeg, psd, png, tiff, bmp and gif. These hundreds or even millions of pixels (which are very tiny) when viewed on screen, produce very vivid and dynamic images. The most common raster graphic is a photograph. Vector file format extensions include: eps, ai and pdf.Ī raster graphic is an image made of little squares of color information called pixels. The most common types of vector graphics are fonts and logos. The vector image “connects the points” and fills in the rest. ![]() So for instance, a 1” x 1” square at 300 dpi will have 300 pixels of information for a raster image, and a vector square will contain just four points, one for each corner. ![]() Vector graphics use mathematical calculations to draw shapes using points, lines or curves.
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