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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.
One color entry in a single GIF or PNG image's palette can be defined as "transparent" rather than an actual color. This means that when the decoder encounters a pixel with this value, it is rendered in the background color of the part of the screen where the image is placed, also if this varies pixel-by-pixel as in the case of a background image .
The Graphics Interchange Format (GIF; / ɡ ɪ f / GHIF or / dʒ ɪ f / JIF, see § Pronunciation) is a bitmap image format that was developed by a team at the online services provider CompuServe led by American computer scientist Steve Wilhite and released on June 15, 1987.
This file has an extracted image: Challenger explosion (cropped).jpg. This image or video was catalogued by one of the centers of the United States National Aeronautics and Space Administration (NASA) under Photo ID: GPN-2004-00012 and Alternate ID: 86-HC-220 .
A mushroom cloud is a distinctive mushroom-shaped flammagenitus cloud of debris, smoke, and usually condensed water vapour resulting from a large explosion. The effect is most commonly associated with a nuclear explosion, but any sufficiently energetic detonation or deflagration will produce a similar effect.
At around 23:30 (15:30 UTC), the first explosion occurred and registered as a magnitude 2.3 earthquake, [16] generating seismic shock-waves energetically equivalent to 2.9 tonnes of TNT. After 30 seconds, a second violent explosion occurred, causing most of the damage and injuries with shock-waves felt many kilometres away.
Blast from a US Navy fuel–air explosive used against a decommissioned ship, USS McNulty, 1972 A thermobaric weapon, also called an aerosol bomb, or a vacuum bomb, [1] is a type of explosive munition that works by dispersing an aerosol cloud of gas, liquid or powdered explosive.
For a typical sub-glacial eruption, overlying glacial ice is melted by the heat of the volcano below, and the subsequent introduction of meltwater to the volcanic system results in a phreatomagmatic explosion. [12] Grímsvötn is host to an active geothermal system and is prone to phreatomagmatic eruptions. [12]