![]() ![]() There is a method called interpolation, where a program injects extra pixels into the image in order to preserve the original dpi. image at 300 dpi and want to print it at 4×6 inches, your resulting print would be at only half the original dpi, or in this case 150 dpi. One final thing to keep in mind about raster graphics is that unlike vector graphics, they cannot be sized up. The resolution of your raster graphics can be determined with programs such as Photoshop and InDesign. For our high definition presses we recommend 350 dpi, with 300 being acceptable for most production work. This is because the average offset press is not capable of printing more information on paper that what is carried in a 240 dpi image. Most offset printers will need your raster graphics to be at least 240 dpi. The first example above we call a 72 dpi image, and the second example a 300 dpi image. We use the term dpi (dots per inch) to convey the amount of information (resolution) of an image. The second image will have a larger file size, but it will also appear much sharper to the naked eye because there is much more information making up the image. x 1in image consisting of 300 pixels (or dots) along each edge is using a total of 90,000 pixels to render the image. image consist of 72 pixels (or dots) along each edge is using a total of 5,184 pixels to render the image. Resolution in raster graphics is very important. #Raster graphics vs vector graphics software#However, when outputting a press file from software such as Illustrator or InDesign, never compress your jpgs below level 8, and use 10 or higher to ensure the best quality. We suggest using jpgs over tiffs to conserve file size and potentially make it easier to transfer your files to your printer. It is common for clients to send us tiff images even when jpg would have done the job. ![]() ![]() Jpeg graphics have the benefit of a smaller file size and generally print very well on offset. In the pre-press environment we often see just. A few raster graphic lines and shapes won’t necessarily ruin your print project (if they are of sufficient resolution), but for the very best results it is better to use raster graphics for photos, textures, and other elements where edge sharpness is not a factor.Ĭommon raster file formats are. When the print process is ultra high definition (like ours) the difference between raster graphic edges and vector edges can be readily noticed with the naked eye. For example, when rendering a diagonal line with a raster graphic, pixels that are half inside and half outside the line will be rendered as a mix between the line color and the background color resulting in a slightly fuzzy edge. Because raster graphics consists of individual pixels, they do not work well to depict lines that do not exactly follow the boundaries of individual pixels. Raster graphics can be used whenever there are no crisp edges or lines in the files you intend for press. Raster graphics can carry tremendous amounts of color information in a relatively small file, especially if they are stored as jpegs. Raster graphics work best for images and hand produced art such as paintings and drawings. Although raster graphics can exist in many file types, the most well known is the jpeg. For example a logo or illustration may also be in a raster format. Besides images, other graphics can also be in raster format. An example of a raster graphic would be any image produced by a digital camera. Raster graphics are image files made up of individual color pixels or dots. In fact, many press ready files will contain a mixture of both of these graphical formats sandwiched into a press ready container such as a PDF. Both are perfectly suitable for press, but each is optimal in different situations. One of the simplest graphical concepts to understand before sending files to your printer is that there are two basic types of graphics vector graphics and raster graphics. ![]()
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