GIF possesses features that, in certain situations, make it a more flexible choice than the JPEG or PNG format. Clear GIFs are most frequently used as web beacons due to their invisibility and small file size.
« Web-Bug » est l'utilisation d'une image de 1 pixel de côté (juste un micro point), au format .gif ou .png, transparente pour être totalement invisible quelle que soit la couleur du fond sur lequel elle est affichée. Comme toutes les images, cette image se trouve sur un serveur distant, d'une tierce partie.
Traductions en contexte de "clear GIF" en anglais-français avec Reverso Context : A web beacon (also called a pixel tag or clear GIF) is a piece of computer code that enables us to monitor user activity and website traffic.
A web beacon (also called web bug, tracking bug, tag, web tag, page tag, tracking pixel, pixel tag, 1×1 GIF, or clear GIF) is one of various techniques used on web pages and email, to unobtrusively (usually invisibly) allow checking that a user has accessed some content.
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So GIF - the Graphics Interchange Format - has the ability to create images that have transparency in them. A "clear" gif is a one pixel image that's simply transparent. As /u/roebert said, they are often abused for tracking purposes. If I send an email and its source body has something like this in there...
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Can parts of GIF be made semi-transparent? Unfortunately no, the GIF format doesn't support partial (alpha-channel) transparency, meaning any pixel can only be fully tansparent or fully opaque, so it's not possible to make partially transparent GIFs and achieve anti-aliasing effect against different backgrounds.
Web bug Also called a "Web beacon," "pixel tag," "clear GIF" and "invisible GIF," it is a method for passing information from the user's computer to a third party website. Used in conjunction with cookies, Web bugs enable information to be gathered and tracked in the stateless environment of the Internet. The Web bug is typically a one-pixel ...