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A "bad" SVG can be identified because it will convert slowly (more than 5 seconds), it will be very large for an SVG (over 500kB-1MB) and it will render very slowly on WP - there is a long wait while the text and other images on the page are loaded, but the SVG image does not show up. Bad SVGs put a lot of strain on the Wiki servers.
Before learning how to convert PDF images to SVG images it may be useful to learn how to extract images from PDF documents and create PNG, GIF, and JPG images. By using Adobe Reader many images in PDF documents can be right-clicked, copied, and then pasted into any image editor. A popular, free image editor good for beginners is IrfanView ...
librsvg, (occasionally stylized as LibRsvg) [2] is a free software SVG rendering library written as part of the GNOME project, intended to be lightweight and portable. [3] The Linux command-line program rsvg-convert uses the library to turn SVG files into raster images.
Under SVG Profiles, choose a profile (usually SVG 1.0 or SVG 1.1). Under Type, if you are not using web-safe fonts, select Convert to outline. (Warning: this greatly increases the size of your file.) If you are using web-safe fonts, choose SVG; under Subsetting, choose None (Use System Fonts). Click OK.
Now that MediaWiki supports SVG, it's usually best to generate SVG images directly. SVG images have many advantages, like being fully resizable, easier to modify, and so on, though they are sometimes inferior to raster images. Decide on a case-by-case basis. A typical plot file could start with:
An image can be reduced or enlarged to an arbitrary size, and will not suffer image data loss, nor will it become pixelated. SVG makes an excellent format for artwork, diagrams and drawings. SVG images are defined in XML text files. This means that they can be searched, indexed, scripted, and compressed.
As these are vector graphics, the images can be scaled to any size, large or small, without loss of quality. Inkscape is a free program used to edit vector graphics. Inkscape provides a graphical user interface for the editing of such diagrams, using the standard Scalable Vector Graphics (SVG) format. [1]
Images composed of simple shapes, lines, and letters such as those below should be recreated using vector graphics as an SVG file. These have a number of advantages, such as making it easier for subsequent editors to edit them, enabling arbitrary scaling at high quality, and sharp high-resolution renderings for print versions.