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Compression of an image to reduce file size (in Kb) is usually "lossy" and is not advised for featured pictures. Image compression will reduce download times and save disk space, but it does so at the expense of fine detail and overall image quality. If in doubt, when saving JPEG files, always select the "maximum" quality setting.
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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.
An example of a 1x1 image. 1:1 pixel mapping is a video display technique applicable to devices with native fixed pixels , such as LCD monitors and plasma displays . A monitor that has been set to 1:1 pixel mapping will display an input source without scaling it, such that each pixel received is mapped to a single native pixel on the monitor.
Since the proportions of File:Flag of Scotland.svg are 5×3, specifying a width of 120px generates a 120×72px image, and specifying a height of 60px generates a 100×60px image, so a size field of 120x60px generates the smaller of the two, namely, the 100×60px image:
Images displayed by the <Gallery>...</Gallery> tag do not obey user viewing preferences. The packed mode will automatically adjust image sizes to use available display space optimally. Every line specifies an image file. The File: prefix is unnecessary. Captions are optional and are separated from file name by a vertical bar ("|").
In the examples above, the size of the image is scaled based on each user's default image size, which can be changed at Special:Preferences. Setting image size in pixels, such as "250px", would override the user's preference and display the image as 250px wide for all users who view that image on that page.
Uploading to Commons is recommended. Files on Commons can be used by wikipedias written in any language and any of Wikipedia's sister projects. Files being used under restricted fair use provisions must be stored on Wikipedia. The markup is the same regardless of where the file is uploaded. The following visual file types may be uploaded: Image ...