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Specifying a size does not just change the apparent image size using HTML; it actually generates a resized version of the image on the fly and links to it appropriately. This happens whether or not you specify the size in conjunction with "thumb". This means the server does all the work of changing the image size, not the web browser of the user.
Specifics. The Cascading Style Sheets (CSS) specification describes how elements of web pages are displayed by graphical browsers. Section 4 of the CSS1 specification defines a "formatting model" that gives block-level elements—such as p and blockquote—a width and height, and three levels of boxes surrounding it: padding, borders, and margins.
{{CSS image crop | Image = The Name of the image file, or may accept {{Annotated image}}. | bSize = The Base Image width in pixels (the image we are cropping on) | cWidth = Crop Image Width in pixels | cHeight = Crop image Height in pixels | oTop = Offset Top in pixels, optional and defaults to 0 when omitted | oLeft = Offset Left in pixels, optional and defaults to 0 when omitted | Location ...
Any image narrower than the preferred width is displayed at the narrower width. Images beside the text should generally use a caption and the thumb (thumbnail) option; the default results in a display 220 pixels wide (170 pixels if the upright option is used), except for those logged-in users who have set a different default in their user ...
Image using width upright=1.8, so that it is 80% wider than the Siberian Husky image above (which is at the default upright=1 width) Image using upright=0.5; a scaling factor less than 1 contracts the image width. An image's size is controlled by changing its width – after which software automatically adjusts height in proportion. (Most ...
To demonstrate specificity Inheritance Inheritance is a key feature in CSS; it relies on the ancestor-descendant relationship to operate. Inheritance is the mechanism by which properties are applied not only to a specified element but also to its descendants. Inheritance relies on the document tree, which is the hierarchy of XHTML elements in a page based on nesting. Descendant elements may ...
The available values for thumbnail size in Preferences (on the Appearance tab) are 120px, 150px, 180px, 200px, 220px (default), 250px, 300px, and 400px. As explained at Wikipedia:Extended image syntax § Size, upright=Factor will "adjust a thumbnail's size to Factor times the default thumbnail size, rounding the result to the nearest multiple of 10".
For lengthy captions under narrow images, it's probably best to add a heights= parameter to make the images somewhat larger, as the default small size, can lead to ugly images. See below. Packed-overlay: This uses <gallery mode=packed-overlay> to produce captions overlaying the bottom of the image. The captions are probably best kept short.