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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.
An animated GIF illustrating a technique for displaying more than the typical limit of 256 colors. ... Transparent background color; this is a bit field, the lowest ...
In addition, transparency is often an "extra" for a graphics format, and some graphics programs will ignore the transparency. Animated PNG 8-bit transparency. Raster file formats that support transparency include GIF, PNG, BMP, TIFF, TGA and JPEG 2000, through either a transparent color or an alpha channel.
Animated Portable Network Graphics (APNG) is a file format which extends the Portable Network Graphics (PNG) specification to permit animated images that work similarly to animated GIF files, while supporting 24 or 48-bit images and full alpha transparency not available for GIFs.
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.
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Could anyone add some words about the transparency features of GIF-palette and animated GIF (evenutally with comparison over the PNG format) ? Transparent backgrounds in a gif image are created by using a color which is not used anywhere else in the gif frames as the background color. It is best to have the
Despite calls by the Free Software Foundation [68] and the World Wide Web Consortium (W3C), [69] tools such as gif2png, [70] and campaigns such as Burn All GIFs, [71] PNG adoption on websites was fairly slow due to late and buggy support in Internet Explorer, particularly regarding transparency. [72]