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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. Only part of a graphic should be ...
WebP is a raster graphics file format developed by Google intended as a replacement for JPEG, PNG, and GIF file formats. It supports both lossy and lossless compression, [8] as well as animation and alpha transparency.
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 ...
Animation is a filmmaking technique by which still images are manipulated to create moving images.In traditional animation, images are drawn or painted by hand on transparent celluloid sheets to be photographed and exhibited on film.
A number of optimization techniques make APNG files as small as possible: Inter-frame optimization [14] utilizing alpha-blend and alpha dispose operations, smaller than the full-size subframes, dirty transparency, color type and color palette optimizations, and various compression options: zlib, 7-Zip, Zopfli. [15]
Microsoft GIF Animator is a historical computer software program for Microsoft Windows to create simple animated GIF files based on the GIF89a file format.It was freely downloadable from the Microsoft Download Center but is now only available through MSDN and on third-party download sites.