The first scanner was made in 1957, using that to scan a Peanuts comic would be some form of "digital comic image" but not a webcomic as we consider it.
I do also thing there's something the kids would call a "meme" that these might be closer to; a comic does NOT have to have a narrative or overarching story (though they often seem to devolve to that) - if the only Far Side comic to exist was Cow Tools it'd still clearly be a comic.
Will Eisner and Scott McCloud say that what distinguishes comics from cartoons and other forms is that they are sequential. McCloud's definition specifically exclude single-panels like "The Far Side" or "The Family Circus". In his view they are cartoons, not comics.
However, other people have pushed back on this particular limitation of his definition.
But then you have newspaper comics - some of which are things like Prince Valiant which are just comic books over time, and then there are the "one joke per day" comics which sometimes have multiple panels, sometimes not.
As with many things, trying to tie it down often reveals that it's not really possible - various "string of one-off" comics (even including The Far Side), political cartoons, etc end up having "recurring characters" that end up with a mythos.
For most people, "digital Far Side" would be a webcomic, because it's something that would live on the comics page in the newspaper.
