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The images may also function as animation frames in an animated GIF file, but again these need not fill the entire logical screen. GIF files start with a fixed-length header ("GIF87a" or "GIF89a") giving the version, followed by a fixed-length Logical Screen Descriptor giving the pixel dimensions and other characteristics of the logical screen.
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. It also retains backward compatibility with non-animated PNG files.
The .png preview above created by RSVG for use in Wikimedia is not animated and may be incomplete or incorrect. To see the animation, open media:Rolling circle optical illusion.svg. It should run in any modern browser or viewer. Recent versions of Chrome, Firefox, Microsoft Edge, Safari, and Opera all support SVG
The spinning dancer is a kinetic, bistable optical illusion resembling a rotating female dancer. The Spinning Dancer, also known as the Silhouette Illusion, is a kinetic, bistable, animated optical illusion originally distributed as a GIF animation showing a silhouette of a pirouetting female dancer.
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It replaced the zoetrope's narrow viewing slits with an inner circle of mirrors that intermittently reflected the images. [50] Soon after the zoetrope became popular, the flip book was introduced in 1868. With its simplicity and compactness, along with its more tactile qualities, the flip book has stayed relatively popular.
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The transparent quality of the cel allows for each character or object in a frame to be animated on different cels, as the cel of one character can be seen underneath the cel of another; and the opaque background will be seen beneath all of the cels. Disney experienced a setback to its ink-and-paint department due to World War II.