Wikipedia:SVG help
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SVG help Scalable vector graphics is a commonly used file format for providing a geometrical description of an image using basic objects such as labels, circles, lines, curves and polygons. 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. Since they are XML files, SVG images can be edited with any text editor, but SVG-based drawing programs are also available. However, the rendering engine used by wiki is not perfect, and may cause the image to be shown incorrectly, or differently from how it is displayed in your vector editor of choice. This page enables authors experiencing problems with SVG graphics to obtain some help in getting their images into wiki the way they intend. |
Things we can help with Understanding SVG
Using SVG appropriately
What you see is not what you get
Something new
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Common problemsTesting for problemsThe following SVG checkers may help you to detect SVG problems before you upload: flowRoot does not appearFile:Error-libsvgr-flow.svg a picture containing SVG1.2-valid flowRoot If black box appear, read c:User:JoKalliauer/RepairFlowRoot how to solve this issue, but do not remove those objects since they might contain text. The workarounds that one can employ are either not to use flowed text (by using the text tool without creating a text field), or convert the text to normal text (by Text-editor or sed-comand, or with Inkscape-GUI or with a Inkscape-batch), but to stroke the text using "object to path", since path-text is not recomended and increases file-size. font-family issuesRendering anomalies of small fonts in thumbnail views Fallback fonts Due to copyright restrictions, MediaWiki cannot use proprietary fonts that are commonly found on several proprietary operating systems. Fonts such as Geneva require licensing fees to distribute. rsvg will not be able to locate such fonts, and the text will fail to appear in the rendered image. There are three solutions to this issue:
For ease of subsequent editing and significantly smaller file sizes, substituting the font with an available font is recommended. Many common fonts have non-proprietary alternatives that are similar in typographical style, resulting in minimal disruption to existing images during substitution. For a list of fonts available in Wikipedia, see available fonts on Meta. Wikimedia has default fonts, and will use Liberation Serif for Times New Roman and Liberation Sans for Arial. For further fallbacks see c:Help:SVG#fallback. Fonts that are available on Wikimedia servers may or may not be available on a visitor's machine. If the placement or appearance of text in the image is important and there is uncertainty about which fonts are installed on a visitor's machine, then converting text into path information may be necessary. bad letter-alignment on small font-sizeLibrsvg calculates the letter-distances inaccurantly for font-sizes of 20px and below. For a text like <svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"> <text x="20" y="30" font-size="5px">exampletext</text> </svg> you can replace it with: <svg viewBox="0 0 1000 1000" xmlns="http://www.w3.org/2000/svg"> <text x="200" y="300" font-size="50px">exampletext</text> </svg> or with <svg viewBox="0 0 100 100" xmlns="http://www.w3.org/2000/svg"> <g transform="scale(0.1)"><text x="200" y="300" font-size="50px">exampletext</text></g> </svg> Missing embedded JPEG imagesWhen a raster graphic is embedded in an SVG it is encoded into base64 data. That data is then assigned a MIME type in the <image> element. In the case of an embedded JPEG, the MIME type is "image/jpeg". Older versions of Inkscape (and possibly other editors) assigned the MIME type "image/jpg". While Inkscape and most web browsers will display such an SVG image just fine, the MediaWiki software that rasterizes the SVG file will have trouble with it. Not recognizing the MIME type "image/jpg" there will simply be an empty space where the image is supposed to be. The fix is to open the SVG file in a text editor, find the <image> element, locate "image/jpg", change it to "image/jpeg" and re-save. At right is an example of this problem. The Commons SVG Checker looks for this problem; see Commons:Commons:Commons SVG Checker/KnownBugs#Checks for details. Though Web browsers cope with image tags without width and height specified, librsvg ignores such images. arc flagsIf circle-segmentes are distorted it is often due to reduced spaces between arc-to-flags, see phab:T217990 for details. Further issuesFurther issues can be found at c:Librsvg_bugs or at Commons:Commons:Commons SVG Checker/KnownBugs, and examples can be found at c:Category:Pictures_demonstrating_a_librsvg_bug. However most issues (for files <1MB) can be fixed using https://svgworkaroundbot.toolforge.org/ (enable "run svgcleaner" and enable "run scour" before clicking convert), for a more detailed list check c:User:SVGWorkaroundBot. Rendering filesMediaWiki (the software from which Wikipedia is run) uses the librsvg-library to rasterize all of its svg files. The version of the rsvg program that is installed on wiki does not always correctly raster the Inkscape or OpenOffice.org SVG files, and does not recognize some formats in text-editor SVG files. The file manager GNOME Files or c:Commons:Commons_SVG_Checker relies on librsvg, so it can be used to check the quality before a SVG is uploaded. Rendering Inkscape filesThere is a simple work-around for the scarcities of librsvg. The operation "Stroke to Path", to be found under Menu>Path in Inkscape or via Ctrl+Alt+C, can be applied to all of the objects that are not rendered correctly. To keep the SVGs editable, this should only be done to the files intended for upload, and these files can be deleted afterwards. As of February 2014, the objects that must be modified to render correctly by librsvg include:
Rendering OpenOffice.org SVG filesOpenOffice.org SVG files may require manual modification before being uploaded to Wikipedia. To achieve this:
NB: Vector graphics line widths may also need to be set explicitly in OpenOffice.org Draw. SVG code replacement guide (executing replace all using Nedit regular expressions)
This SVG export procedure has been tested using OO 2.3.0 and OO 3.2.1 with a simple .odg candidate. Rendering text-editor SVG filesSVG files created from scratch in a text editor may make use of any valid SVG syntax, so long as your browser supports the given version of the SVG specification. On Wikipedia however, SVGs are interpreted by the librsvg-library to create PNG previews at different image sizes. That library only recognizes a subset of all valid SVG syntax, and may render your SVG without many features. In order to bypass these deficiencies in the library, there are certain parameters that need to be formatted in specific ways or be assigned a workaround value in order for librsvg to accurately render views of your SVG file. <mask> parameter maskUnits="userSpaceOnUse"The librsvg-library does not interpret the value of parameter stroke-dasharrayThe librsvg-library does not accept a Use xlink:href=, not href= alone, in
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User:RCraig09/Excel to XML for SVG
Assistance
If you have a tricky SVG file with a problem not described, or can't quite figure out what the previous section was talking about, you can simply ask for assistance by posting a quick note hereafter that outlines the problem, as well as providing links to the files that are exhibiting these problems. Don't forget to sign your name with four tilde symbols (~~~~) and an editor will attempt to reply here to help!
When you are happy that a request has been fulfilled, just leave a note so that the request can be archived later, as needed.
An alternative source of help is Commons:Graphics village pump.
Current requests
_RSVG-BUG.svg){kind=link}
Grid making thumbnail very dark at small sizes
Hi SVG experts,
Though the grid in my diagram is white, it is rendered as black at thumbnail sizes under 324px. Would anyone know how to fix the problem for small thumbnails?
Thanks,
cmɢʟee⎆τaʟκ 02:33, 15 November 2021 (UTC)
- @Cmglee: Might it be related to c:Librsvg_bugs#Pattern and c:User_talk:TilmannR/Archive#librsvgBug_pattern? — Johannes Kalliauer - contrib. 10:41, 22 November 2021 (UTC)
- Thanks, JoKalliauer I'll check out your links to see if there is a workaround. cmɢʟee⎆τaʟκ 22:10, 27 November 2021 (UTC)
Electoral College Map
I would really appreciate it if one of you wonderful experts could make a map similar to this one...
https://upload.wikimedia.org/wikipedia/commons/2/22/2021_US_Electoral_College_objections_map.svg
....except for different colors for different states. I would like to see a map where most of the states are green (#A9FAAD), but all of the following states are yellow (#FFE4E4) - Alabama, Florida, Georgia, Michigan, Mississippi, North Carolina, South Carolina, West Virginia, Wisconsin, Wyoming.
Capisred (talk) 23:56, 16 November 2021 (UTC)
- @Capisred: Can you ask again at Wikipedia:Graphics_Lab/Map_workshop? This page is for issues on existing SVG files with the thumbnail renderer. Thanks, cmɢʟee⎆τaʟκ 02:10, 17 November 2021 (UTC)
File:Brondby IF logo.svg
Hello!
I managed to workaround this problem, see File:Brøndby IF.svg. I still just want to know why it renders so weirdly. When I press "Edit SVG" using c:User:Rillke/SVGedit.js the browser rendering is exactly as it should but the RSVG rendering isn't. Opening the file in Inkscape also just makes it all black. Any clues why?Jonteemil (talk) 03:51, 19 November 2021 (UTC)
- @Jonteemil: I've fixed the SVG by renaming CSS class names starting with underscores to "blue" and "yellow". http://w3.org/TR/css-syntax-3 states, "Property names and at-rule names are always identifiers, which have to start with a letter or a hyphen...". Is the thumbnail fine now? cmɢʟee⎆τaʟκ 00:19, 22 November 2021 (UTC)
- P.S. You've uploaded another version at File:Brøndby_IF.svg. What's the difference? cmɢʟee⎆τaʟκ 00:35, 22 November 2021 (UTC)
- @Cmglee: Thanks for your answer. The version at File:Brøndby_IF.svg is as I said my workaround by using a different method for extracting the SVG.Jonteemil (talk) 08:16, 23 November 2021 (UTC)
- Ok, I've replaced uses of File:Brøndby IF.svg with File:Brondby IF logo.svg which doesn't have the Inkscape crud. cmɢʟee⎆τaʟκ 22:16, 27 November 2021 (UTC)
Not rendering but only on wikipedia
Can someone take a look at this file File:Youth Law Australia logo.svg, I can not get it to render on wikipedia, but it renders everywhere else. Even on the Commons SVG Checker. And even in the file history of the same file, but only when the file is not the current version. I really don't understand the wikipedia rendering engine. Auguel (talk) 21:16, 29 November 2021 (UTC)
- Ok it now seems to be rendering, so I guess this is resolved, but my understanding of the engine has gone down. Auguel (talk) 00:05, 30 November 2021 (UTC)
- @Auguel: Next time try c:Template:Purge_client_cache — Johannes Kalliauer - contrib. 10:32, 30 November 2021 (UTC)
Text rendering in infobox or commons page
Hello, I hope this is the right place. I made and uploaded a vectorial file and it doesn't render the text properly. I transformed the text into "path" as it should. Instead of showing the black text in bold letters, it looks simple and less scattered as it should be. The correct version is only visible when you click to see it at the real resolution. Does anyone know how it can be solved?--Kun Kipcsak (talk) 16:48, 1 December 2021 (UTC)
_logo.svg){kind=link}
- @Kun Kipcsak:
- — Johannes Kalliauer - contrib. 17:51, 1 December 2021 (UTC)
- @JoKalliauer: Thank you. It worked.--Kun Kipcsak (talk) 20:06, 1 December 2021 (UTC)
Artifacts when using feSpecularLighting and feDistantLight
Hi SVG experts,
I just created this image using an SVG filter to simulate 3D tiles. Strangely, the shapes are surrounded by black pixels. Anyone seen this or know a fix?