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Saving snapshots and movies

Pressing S takes a snapshot of the current scene, and saves it to a graphics file named snapshot#.png, where # is the first number that is available. Thus pressing S multiple times will save files
  snapshot1.png
  snapshot2.png
  ...
without any existing files being overwritten.

The graphics format PNG (Portable Network Graphics) is a bitmap image format with lossless compression, and the images are stored as 24-bit RGB files, 8-bits per channel, using the screen resolution of the display window. For more information, see www.libpng.org.

Pressing M creates a movie by playing the frames from beginning to end, and saving snapshots so that a total of params.num_movies_frames frames is generated. This parameter may be changed by editing its value in effview.params, as described in the next section; its default value is 200. The files are named movie#_#.png, where the first number is the first prefix available, and the second number ranges from 1 to the number of frames.

As with the snapshots, the key M can be pressed multiple times without overwriting previously stored files.

To convert the movie PNG files into a single movie file, once can use the convert program included in ImageMagick utilities. For example, to create an animated GIF:

  convert movie1_*.png movie.gif
or to create an MPEG-1 file suitable for inclusion in a PowerPoint presentation:
  convert movie1_*.png movie.mpg
For more information, and to download the software, see www.imagemagick.org. Even higher quality movies can be created from the PNG files using the commercial program VideoMach, see gromada.com/videomach.html.


next up previous contents index
Next: eFFview parameters Up: The eFFview visualizer Previous: Basic commands   Contents   Index
Julius 2008-04-29