The resolution of a raster file is referred to in DPI (dots per inch) or PPI (pixels per inch). If you zoom in or expand the size of a raster image, you start to see the individual pixels. One of the main differences between raster and vector files is their resolution. They represent images in very different ways, so there’s a lot to consider when deciding which one to use. Some of the main differences between raster and vector include: Raster and vector files are the two most popular formats used for visual content. What is the difference between raster and vector files? Vector files use mathematical equations, lines, and curves with fixed points on a grid to produce an image. There are no pixels in a vector file. A vector file’s mathematical formulas capture shape, border, and fill color to build an image. Because the mathematical formula recalibrates to any size, you can scale a vector image up or down without impacting its quality. Raster files are images built from pixels - tiny color squares that, in great quantity, can form highly detailed images such as photographs. The more pixels an image has, the higher quality it will be, and vice versa. The number of pixels in an image depends on the file type (for example, JPEG, GIF, or PNG). Raster vs. vector files: frequently asked questions.What is the difference between raster and vector files?.And use the most recent version 8.71 (soon to be released: 9.00) of Ghostscript. That's why I'd suggested you convert your PDFs in one go to PNG (or JPEG) using Ghostscript directly. (Conversion in the opposite direction, PS => PDF, therefor is not that critical.) PDF can embed TrueType fonts, which PostScript can not.PDF can handle transparencies, which PostScript can not.Because you never win and harldy keep quality in the first step, but very often loose some. The detour of IM to call Ghostscript twice to convert first PDF => PS and then PS => PNG is a real blunder.That's why sometimes people here suggest to add -density 600 as a convert parameter which tells Ghostscript to use a 600 dpi resolution for its image output. By default, if you don't give an extra parameter, Ghostscript will output images with a 72dpi resolution.And in much better quality.Ībout IM's handling of PDF conversion to images via the Ghostscript delegate you should know two things first and foremost: Works, but isn't the most efficient way if you know that Ghostscript can do PDF => PNG in one go. So how does IM get (E)PS from your PDF? Easy: convert -list delegate | findstr /i PDFĪh! It uses Ghostscript to make a PDF => PS conversion, then uses Ghostscript again to make a PS => PNG conversion. You'll discover that IM does produce PNG only from PS or EPS input. If you are on Windows, try this: convert -list delegate | findstr /i png (On my system that's a list of 32 different commands.) Now to see which commands are used to convert to PNG, use this: convert -list delegate | grep -i png You can learn about the detailed settings ImageMagick's "delegates" (the external programs ImageMagick uses, such as Ghostscript) by typing convert -list delegate it then uses Ghostscript for PostScript => PNG conversion.
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