Editing Vtk/MovieMaking (section)

====Using Keynote====
On 30 May 2021, I acquired a new iMac to replace the (desktop) Mac Pro that I have relied on since 2010.  This new system's "Big Sur" (v11.4) macOS encounters an error when I try to execute ''convert''; I think this is because convert's binary executable is incompatible with my new iMac's CPU hardware.  [https://support.apple.com/guide/keynote/create-an-animated-gif-tan30ff1f63c/mac Online discussions] appear to recommend that animated gifs be constructed using Apple's "Keynote" (''aka'' Powerpoint) utility.
* Create a new, blank Keynote file;
* Paste (drag-and-drop) the first gif image onto the first slide of this new file;
* Add a second, blank slide to the Keynote file, then paste the 2nd gif image onto this slide;
* etc.; [make sure each image sits in precisely the same position on each slide]
* Under Keynote's "File" dropdown menu, 
** choose "Export to ... Animated gif ..."
** identify the range of slides (e.g., 2 thru 28) that are to be incorporated into the animation, and the desired frame rate;
** click "Next", etc.