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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.
One color entry in a single GIF or PNG image's palette can be defined as "transparent" rather than an actual color. This means that when the decoder encounters a pixel with this value, it is rendered in the background color of the part of the screen where the image is placed, also if this varies pixel-by-pixel as in the case of a background image .
The Graphics Interchange Format (GIF; / ɡ ɪ f / GHIF or / dʒ ɪ f / JIF, see § Pronunciation) is a bitmap image format that was developed by a team at the online services provider CompuServe led by American computer scientist Steve Wilhite and released on June 15, 1987.
AVIF is an image format developed by the Alliance for Open Media. AVIF was designed by the foundation to make up for the shortcomings of other image codecs, including PNG, GIF, and WebP. [65] AVIF is generally smaller in size than both WebP and PNG. [66] AVIF supports animation while PNG does not and has a superior image quality when compared ...
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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All BMP frames are opened in the graphic editor, use 'Save As' gif for each frame, and select the option to target the background color for removal before saving the individual frames in gif format. The transparent background gif is then compiled from the individual gif frames. I just did, please look it over closely.--branko
Visually transparent compression: XS compressed content is indistinguishable from the original uncompressed content (passing ISO/IEC 29170-2 tests) for compression ratios between 2:1 and 10:1. Low latency: The total end-to-end latency, introduced by the JPEG XS compression-decompression cycle, is minimal. Depending on the configuration, XS ...