It is planned to allow Metview to directly create animated files. In the meantime, it is easily possible to convert its PostScript output using the ImageMagick convert command. Below are some examples of doing this, along with an example showing how to incorporate this into a Metview macro.
Please note, if you only try to achieve an animation with a relative small number of images within PowerPoint you might want to consider the options provided by PowerPoint. The Insert > Photo Album might be one of them.
Converting a multi-page PostScript to an animated GIF
convert -delay 200 -rotate "90<" input.ps output.gif
Tip: Alter the speed of animation
To change the animation speed use
convert -delay 100 input.gif output.gif
Tip: High-quality larger images
Simply setting the -geometry flag to obtain a larger output file does not ensure high quality; instead use something like
convert -density 150 input.gif output.gif
Tip: Continuous looping
Some viewers, especially some versions of MS PowerPoint, only play a single animation cycle. To make it continuous you can use the option -loop with convert:
convert -loop 999 input.gif output.gif
NOTE: In Microsoft PowerPoint in most cases it should work to import the GIF as an 'Image'. If the GIF is imported as a 'Video file', PowerPoint requires extra settings for continuous looping of GIFs. Go to the "video tools" menu, which contains "format" and "playback". Under the playback menu, there is a button "Loop until stopped". Click on it, to allow continuous loops!
Tip: Transparent background
You can also use convert to replace any white in the image with a transparent background:
convert -fuzz 10% -transparent white input.gif output.gif
Example Metview Macro
The following macro retrieves several time steps of data from MARS, plots them to a PostScript file and uses the
convert command to generate an animated gif. The result is shown on this page.