![]() ![]() $ identify out-deconstruct.gif | head -n 3 $ convert out-convert.gif -coalesce -resize 256x -deconstruct out-deconstruct.gif $ convert out-convert.gif -coalesce -resize 256x out-coalesce.gif $ convert out-convert.gif -resize 256x out.gif Using the test data from this answer: How do I create an animated gif from still images (preferably with the command line)? we can see this clearly with identify: $ identify out-convert.gif | head -n 3 coalesce then expands all the frames to the original size, which makes the resize work, but it does not re-compress the frames again as your input image: -deconstruct is needed for that! The root cause of the problem is that your input GIF was properly minimized: GIF allows the next frame to be just the modified rectangle from the previous one at an offset. After -coalesce, you likely want to add a -deconstruct: convert in.gif -coalesce -resize 256x -deconstruct out-deconstruct.gif The full size image sequence is also available at. See File:PIA07712 - F ring animation videoquality 10 framerate 2.5.ogv for a better quality version. gifsicle and ffmpeg2theora-0.25.exe were used to cconvert the GIF to this file. This is a Theora video, at one frame per second, converted from File:PIA07712 - F ring animation.gif, a half-sized and pruned copy of NASA's animated GIF version of the sequence. Porco) are based at the Space Science Institute in Boulder, Colo.įor more information about the Cassini-Huygens mission, visit and the Cassini imaging team home page. The imaging operations center and team lead (Dr. The imaging team consists of scientists from the US, England, France, and Germany. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the Cassini-Huygens mission for NASA's Science Mission Directorate, Washington, D.C. ![]() The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. ![]() The visible light images in this sequence were acquired using the narrow angle camera on Apfrom a distance of approximately 1.2 million kilometers (700,000 miles) from Saturn. Several background stars are seen moving across the field during the movie. The gores, together with the sheared-out material due to differential orbital motion, create the dark, diagonal drapes. The material closer to Prometheus orbits the planet faster than the material closer to the bright F ring core. With time, the ring material previously affected falls behind so that on the next apoapse passage of Prometheus, a new gore in the inner ring material is made. It is during these apoapse passages that Prometheus has its greatest influence on the fine ring material. The moon passes comes closest to the ring at “apoapse”, when it is farthest from Saturn. Prometheus orbits closer to Saturn, and thus faster, than the icy particles that make up the F ring. Radial structure in the bright core of the ring is visible throughout the movie. Prometheus appears first in the sequence, interior to the F ring, and Pandora (84 kilometers, 52 miles across) follows along outside of the ring. English: This movie sequence from Cassini shows dark drapes in the inner strands of the F ring caused by the gravitational influence of the shepherd moon Prometheus (102 kilometers, 63 miles across).
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