Help:Images

This page explains the image syntax when editing. You or another user must usually upload an image before you can use it on a page.

Images that are stored on server are usually rendered by using the   namespace prefix (but the legacy   namespace prefix is still supported as a synonym) as the target of a wiki link. The alternate  namespace prefix is also usable to reference the original media file content (for rendering or downloading it separately, outside of any wiki page).

Supported media types for images
The following file formats are supported by default:
 * .jpg or .jpeg : bitmap image compressed in the standard JPEG format (this lossy format is most suitable for photographs).
 * .png : bitmap image in the Portable Network Graphics format (specified by the W3 Consortium).
 * .gif : bitmap image in the legacy Graphics Interchange Format.
 * .svg : scalable image in the Scalable Vector Graphics format (specified by the W3 Consortium).

Other media types may be supported, but it may not be possible to display them inline.

Syntax
The full syntax for displaying an image is:

where options can be zero or more of the following, separated by pipes :
 * Format option: one of  and/or ,  ,   (or  );
 * Controls how the rendered image is formatted and embedded in the rest of the page.
 * Note: that by writing, you can use a different image for the thumbnail.
 * Resizing option: one of
 * : resizes the image to fit within the given maximum width in pixels, without restricting its height;
 * : resizes the image to fit within the given maximum height in pixels, without restricting its width;
 * : resizes the image to fit within the given width and height in pixels;
 * : resizes an image to fit within reasonable dimensions, according to user preferences (suitable for images whose height is larger than width).
 * Note: that the image will always retain its aspect ratio, and can only be reduced (not increased) in size unless it's in a scalable media type (bitmap images cannot be scaled up). The default maximum size depends on the format and the internal image dimensions (according to its media type).
 * Horizontal alignment option: one of,  ,  , or  ;
 * Controls the horizontal alignment (and inline/block or floating styles) of the image within a text (no default value).
 * Vertical alignment option: one of,  ,  ,  ,  ,  ,  ,  ;
 * Controls the vertical alignment of a non-floating inline image with the text before or after the image, and in the same block (the default vertical alignment is ).
 * Link option: one of
 * : allows to change the target (to an arbitrary page title, or URL) of the generated link, activable on the rendered image surface; e.g.  renders as Wiki-help-example.jpg (external link), or   renders as Wiki-help-example.jpg (internal link).
 * : displays an image without any activable link; e.g.  renders as Wiki-help-example.jpg.
 * Note: Link does not work with thumb, thumbnail or frame options.
 * Other specific options:
 * : defines the alternative text (maps to the HTML attribute  of the generated   element) of an image that will be rendered if either the referenced image cannot be downloaded and embedded, or if the support media must use the alternative description text (e.g. when using a Braille reader or with accessibility options set by the user in its browser).
 * : renders the specified page number (currently only applicable when showing a .pdf file).

The options can be given in any order. If the given options conflict each other, the latter is applied, except for the format options, where the options take the priority in the order of: ;   (or  );   and/or.

If a parameter does not match any of the other possibilities, it is assumed to be the caption text. Caption text shows below the image in  and   formats, or as mouseover text in ,   formats or when the format is omitted. Caption text displayed in the  and   formats may contain wiki links and other formatting. In the other options, wiki-formatting will not work though transclusion will.

If no caption text is supplied, a caption is automatically created showing the file name. To completely remove the caption, set it to. For example,  renders as.

Format
The following table shows the effect of all available formats.

Size and frame
Among different formats, the effect of the size parameter may be different, as shown below.
 * For how it appears when its size is not specified, see Format section above.
 * When the format is not specified, or only ed, the size can be both reduced and enlarged to any specified size.
 * In the examples below, the original size of the image is 300 × 200 pixels.
 * An image with  always ignores the size specification, the original image will be reduced if it exceeds the maximum size defined in user preferences.
 * The size of an image with  can be reduced, but can not be enlarged beyond the original size of the image.

Horizontal alignment
Note that when using the  or   formats, the default horizontal alignment will be.

Vertical alignment
The vertical alignment options take effect only if the image is rendered as an inline element and is not floating. They alter the way the inlined image will be vertically aligned with the text present in the same block before and/or after this image on the same rendered row.

Note that the rendered line of text where inline images are inserted (and the lines of text rendered after the current one) may be moved down (this will increase the line-height conditionally by additional line spacing, just as it may occur with spans of text with variable font sizes, or with superscripts and subscripts) to allow the image height to be fully displayed with this alignment constraint.

To show the alignment result more clearly, the text spans are overlined and underlined, the line-height is increased to 200% of the font-height, the font-height is emphasized with a yellow background covering the line margins, and the full line-height is shown with a dark gray border; additionally images of different sizes are aligned, including one with an additional border that adds some pixels to its specified dimensions and slightly changes its vertical alignment:

 text top: text

 text text-top: text

 text super: text

 text baseline: text

 text sub: text

 text default: text

 text middle: text

 text text-bottom: text

 text bottom: text

Notes:
 * 1) The "middle" vertical alignment position of the image (which is also the default) usually refers to the middle between the x-height and the baseline of the text (on which the vertical middle of the image will be aligned, and on which usually the text may be overstroke), but not to the middle of the line-height of the font-height that refers to the space between the "text-top" and "text-bottom" positions ; the font-height excludes:
 * 2) * the additional line separation spacing normally divided equally into two line-margins (here 0.5em, according to line-height set to 200%) above and below the font-height).
 * 3) * the additional line spacing which may be added by superscripts and subscripts.
 * 4) However, if the image height causes its top or bottom position to go above or below the normal full line-height of text, the middle position will be adjusted after the increasing the top and/or bottom line-margins so that the image can fit and align properly, and all images (including those with smaller heights) will be vertically centered on the adjusted middle position (for computing the effective line-height, the text of each rendered row with the larger font-height will be considered).
 * 5) The "text-top" and "text-bottom" alignment positions also excludes the extra line spacing added by superscripts and subscripts, but not the additional line-spacing defined by the line-height.
 * 6) The "top" and "bottom" alignment positions take into account all these extra line spacings (including superscripts and subscripts, if they are present in a rendered line span). When the image alignment constrains the image to grow above or below the normal line-spacing, and the image is not absolutely positioned, the image will cause the "top" and "bottom" positions to be adjusted (just like superscripts and subscripts), so the effective line-height between rendered lines of text will be higher.
 * 7) The "underline", "overline" and "overstrike" text-decoration positions should be somewhere within these two limits and may depend on the type and height of fonts used (the superscript and subscript styles may be taken into account in some browsers, but usually these styles are ignored and the position of these decorations may not be adjusted); so these decorations normally don't affect the vertical position of images, relatively to the text.

Stopping the text flow
On occasion it is desirable to stop text (or other inline non-floating images) from flowing around a floating image. Depending on the web browser's screen resolution and such, text flow on the right side of an image may cause a section header (for instance, ==My Header== ) to appear to the right of the image, instead of below it, as a user may expect. The text flow can be stopped by placing clear before the text that should start below the floating image.

All images rendered as blocks (including non-floating centered images, left- or right-floating images, as well as framed or thumbnailed floating images) are implicitly breaking the surrounding lines of text (terminating the current block of text before the image, and creating a new paragraph for the text after them). They will then stack vertically along their left or right alignment margin (or along the center line between these margins for centered images).

Altering the default link target
The following table shows how to alter the link target (whose default is the image description page) or how to remove it. Changing the link does not alter the format described in the previous sections.

Gallery syntax
It's easy to make a gallery of thumbnails with the  tag. The syntax is:

Optional gallery attributes
The gallery tag itself takes several additional parameters, specified as attribute name-value pairs:

Link to description page
If you put a colon before , the image will not be embedded and the link will lead to the description page of the file.





results in

File:Wiki-help-example.jpg

Sunflowers

Link to another page
This will make a 50px width picture with a link to the page Main Page:



results in
 * Wiki.png
 * Note: link does not work with thumb or frame.

Link directly to the media file
You can use the pseudo-namespace “   ” to link directly to a file without rendering it, bypassing the description page.

Media:Wiki-help-example.jpg

Sunflowers

results in

[[Media:Wiki-help-example.jpg]]

[[Media:Wiki-help-example.jpg|Sunflowers]]

The same result can be achieved by adding a colon before the namespace (works with categories too):

File:Wiki-help-example.jpg

You can also use:

/Wiki-help-example.jpg

which can be used to link to a potential file, even if it doesn't exist. You can also use:

which generates an external URL to the file inline:

Files at other websites
You can link to an external file available online using the same syntax used for linking to an external web page. With these syntaxes, the image will not be rendered, but only the text of the link to this image will be displayed. 

Or with a different displayed text: link text here

Additional MediaWiki markup or HTML/CSS formatting (for inline elements) is permitted in this displayed text (with the exception of embedded links that would break the surrounding link): Example  rich   link text  here. which renders as: Example  rich   link text  here.