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This category may be empty occasionally or even most of the time. Wikimedia Commons has media related to Images with opaque backgrounds . The images would be better with a transparent background.
This image has partial transparency (254 possible levels of transparency between fully transparent and fully opaque). It can be transparent against any background despite being anti-aliased. Some image formats, such as PNG and TIFF, also allow partial transparency through an alpha channel, which solves the edge limitation problem.
English: A 1×1 transparent image. Useful for when a template requires an image but you don't have one. ... For when you need a blank image. File usage.
Image:BlankMap Thailand.png – Thailand provinces, 20% rescaling factor suggested. Image:China blank map-1.png – People's Republic of China; Image:China blank map-2.png – People's Republic of China; Image:Hong Kong District Locator (template map).png – Hong Kong Special Administrative Region of the People's Republic of China.
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.
A color spectrum image with an alpha channel that falls off to zero at its base, where it is blended with the background color.. In computer graphics, alpha compositing or alpha blending is the process of combining one image with a background to create the appearance of partial or full transparency. [1]
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Transparent background color; this is a bit field, the lowest bit signifies transparency 311: 00 00: Delay for animation in hundredths of a second; not used: 313: 10: 16: Color number of transparent pixel in GCT 314: 00: End of GCE block Image Descriptor 315: 2C ',' An Image Descriptor (introduced by 0x2C, an ASCII comma ',') 316: 00 00 00 00 ...