[rjwse@aol.com]

You can copy this screenshot text into calibre snippets, then invoke it in the editor with kb1 followed by ctrl-j. The <style></style> command and a template for an image will appear with the cursor at the $1 placeholder. You can start typing any img already in the book. It will autocomplete. immediately the img will zoom/unzoom according to your set speed. Use sparingly for good taste. Unlike videos and even animated GIFs, this uses up very little overhead. I uploaded editor image as an animated GIF and from that you can see the img moving, but I fear that when uploaded it will show on this forum only as a still picture. See calibre manual how to add an img to editor and how to add a new snippet. The very first time I ever saw "The Ken Burns Effect" was in his best documentary "The Civil War". Best regards, Pop