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The most obvious advantage of vector images over raster graphics is that vector images are quickly and perfectly scalable. Inherently, vector-based graphics are more malleable than raster images - thus, they are much more versatile, flexible and easy to use. Most created images (as opposed to natural images) meet these specifications, including logos, letterhead, and fonts. Because vector graphics are composed of true geometric primitives, they are best used to represent more structured images, like line art graphics with flat, uniform colors. Unlike pixel-based raster images, vector graphics are based on mathematical formulas that define geometric primitives such as polygons, lines, curves, circles and rectangles. Despite its shortcomings, raster format is still the Web standard - within a few years, however, vector graphics will likely surpass raster graphics in both prevalence and popularity. Common raster formats include TIFF, JPEG, GIF, PCX and BMP files. Remember though that some images, like photographs, are still best displayed in raster format. Overall, as compared to vector graphics, raster graphics are less economical, slower to display and print, less versatile and more unwieldy to work with. Just as raster files are significantly larger than comparable vector files, high resolution raster files are significantly larger than low resolution raster files. Thus, high resolution images should only be used if your equipment has the capability to display them at high resolution.īetter resolution, however, comes at a price. Remember also that the resolution you actually observe on any output device is not a function of the file’s own internal specifications, but the output capacity of the device itself. The higher the dpi, the better the resolution.
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Resolution in raster graphics is measured in dpi, or dots per inch. To maximize the quality of a raster image, you must keep in mind that the raster format is resolution-specific - meaning that raster images are defined and displayed at one specific resolution. Although raster images can be scaled down more easily, smaller versions often appear less crisp or “softer” than the original. Hence, your raster-based logo, magnified to 1000, becomes bitmapped before you know it. Why? Ultimately, when you look close enough, you can begin to see the individual pixels that comprise the image. Just like photographic images that get blurry and imprecise when blown up, a raster image gets jagged and rough. However, because raster images are pixel-based, they suffer a malady called image degradation. Non-line art images are best represented in raster form because these typically include subtle chromatic gradations, undefined lines and shapes, and complex composition.
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I don't know why this is and haven't found one perfect solution.Raster graphics are best used for non-line art images specifically digitized photographs, scanned artwork or detailed graphics. It also affects the text in the dimension strings. Like I said, some of these work some of the time, but nothing works ALL the time. One of those discussions can be found here: Explode the MText string and then FLATTEN it Copy and paste the entire existing drawing into a new drawing Make sure the "z" component of the text is set to "0" I've searched the ACAD forums and come across a few solutions with varying degrees of success: In some of the drawings that I've worked on, the text (a True Type font) both appears on the screen and when plotted to be "fatter" than normal, almost like its in bold, but it's not. I've run into this problem with many versions of AutoCAD in the past and in the present and my obsessive compulsiveness wants to figure out what the hell is going on.