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2. Spacer GIF - Wikipedia

   en.wikipedia.org/wiki/Spacer_GIF

   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.

3. PNG - Wikipedia

   en.wikipedia.org/wiki/PNG

   When converting an image from the PNG format to GIF, the image quality may suffer due to posterization if the PNG image has more than 256 colors. GIF intrinsically supports animated images. PNG supports animation only via unofficial extensions (see the section on animation, above). PNG images are less widely supported by older browsers.

4. Transparency (graphic) - Wikipedia

   en.wikipedia.org/wiki/Transparency_(graphic)

   This image shows the results of overlaying each of the above transparent PNG images on a background color of #6080A0. Note the gray fringes on the letters of the middle image. This shows how the above images would look when, for example, editing them. The grey and white check pattern would be converted into transparency.

5. WebP - Wikipedia

   en.wikipedia.org/wiki/WebP

   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.

6. APNG - Wikipedia

   en.wikipedia.org/wiki/APNG

   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.

7. GIF - Wikipedia

   en.wikipedia.org/wiki/GIF

   An animated GIF illustrating a technique for displaying more than the typical limit of 256 colors. To render a full-color image as a GIF, the original image must be broken down into smaller regions having no more than 255 or 256 different colors. Each of these regions is then stored as a separate image block with its own local palette and when ...