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For guidance on the syntax for doing this, see Help:Infobox picture. In very brief summary, one hurdle that trips up many people when attempting to add an image to an infobox template is that most internally provide the wiki code that "wraps" the image. Accordingly, you do not usually add the brackets, number of pixels, and other code details ...
There are 4 basic choices for image file formats : SVG for simple diagrams (especially those that need to be scaled). JPEG for photographic images. GIF for animated images. PNG for everything else. While some formats offer multiple compression systems, in general the format and the compression system are tied together.
Transparency (graphic) GIF animation of an Apollonian sphere packing with transparent background. Transparency in computer graphics is possible in a number of file formats. The term "transparency" is used in various ways by different people, but at its simplest there is "full transparency" i.e. something that is completely invisible.
Template:Annotated image. This template allows the addition of explanatory notes to images in the form of actual text (which can also contain links), which is usually more legible than text built into the image – especially if the image is reduced to thumbnail size. Other uses include cropping an image to exclude unimportant parts and perhaps ...
The method used for selecting the colours for various top-level pages, e.g. Main Page, Community Portal, Contents, and Help:Contents. The 3 colours are generated using the HSV colour space, then translated into RGB. Note: for layouts with no spacing between borders, use the darker border colour.
This adds a CSS class with name box-name to the HTML element, for use by bots or scripts. type. If no type parameter is given, the template defaults to type notice. That means it gets a blue background. image. No parameter = If no image parameter is given, the template uses a default image. Which default image it uses depends on the type parameter.
Background colors. Transparent backgrounds are fine, but do not think your image will always be displayed on a light or white background. The wikipedia smartphone app, for instance, renders images on a black background, so if you show black text on a transparent background it will be invisible. Testing for problems
Uploading images to Wikipedia is a matter of: clearly establishing that the copyright status of each intended upload is appropriate for a free-content encyclopedia; and then; uploading the image with clear labeling as to its origin and copyright status. If you want to upload multiple images using the New wizard, use Commons:Special:UploadWizard.