A single-pixel GIF file set to a transparent status and thus invisible. Also known as a "transparent GIF," "1-by-1 GIF" and "clear GIF," it is is used as a tracking mechanism for Web pages to monitor ...
The GIF format uses the LZW compression algorithm, which was patented by Unisys, and publishers of applications that read and write GIF87a and GIF89a images were required to obtain a license and pay ...
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