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The only requirement was that this image was invisible, either by being the same color as the page, or by being transparent. Spacer GIFs themselves were small transparent image files. GIF files were used as it was a common format that supported transparency, unlike JPEG. These files were commonly named spacer.gif, transparent.gif or 1x1.gif.
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.
[35] [36] A GIF image can include multiple image blocks, each of which can have its own 256-color palette, and the blocks can be tiled to create a complete image. Alternatively, the GIF89a specification introduced the idea of a "transparent" color where each image block can include its own palette of 255 visible colors plus one transparent color.
The AOL.com video experience serves up the best video content from AOL and around the web, curating informative and entertaining snackable videos.
On small images, GIF can achieve greater compression than PNG (see the section on filesize, below). On most images, except for the above case, a GIF file has a larger size than an indexed PNG image. PNG gives a much wider range of transparency options than GIF, including alpha channel transparency.
This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.
In normal circumstances, images are scaled down automatically by Wikipedia's server. This does not happen for animated GIFs. Instead the original animated GIF is downloaded, and whether the image is scaled to fit the allotted space depends on the capabilities of the browser. Videos are not scaled down either, which wastes bandwidth.
This image or logo only consists of typefaces, individual words, slogans, or simple geometric shapes. These are not eligible for copyright alone because they are not original enough, and thus the logo is considered to be in the public domain. See Wikipedia:Public domain § Fonts or Wikipedia:Restricted materials for more information.