How can I get much better resolution in that game? All resolutions are very bad - game and movies.

It was designed for 640x480 with human live action.
No, there are no suitable upscaler for it yet.
Try to play it in a window, or play it fullscreen with an CRT.

Maybe ask Jane Jensen nicely for a remaster?

The dosbox config has settings for graphics which might make them better.

To stay fair, they did this because many systems weren's strong enough to handle non-interlaced FMV back in the days. Also, because of the low resolution it's arguable if non-interlaced really is looking better. You see the artefacts much better in non-interlaced mode.

Sure, but what I don't get is why they didn't simply include an option to disable that stuff, I know Phantasmagoria had one, but none of their other games did.

No idea. However afaik the videos themselves never were saved interlaced - I am pretty sure I once tried a patch that was able to play them non-interlaced as well. Still the question why Sierra did not integrate that option into the game in the first place remains.

I don't mind the low resolution - it will always be one of my favorite FMV point and clicks ... as a German it's even more fun listening to the "German" inside the game.

That's right, they never were. Which is why 20 years later ScummVM can suddenly play non-interlaced videos of Phanta 2, GK2, even the FMV sequences in Shivers. "Nain, ick sprecke kain English!" xD

The German dub for GK2 is also hilarious. There is this sequence where you bring a tape to your lawyer and ask him to translate it for you. And then the guy proceeds to translate... from German to German. It's utterly bizarre!

It's a shame it was 2D digitized backgrounds. Other FMV games that mixed the "real" characters with traditional backgrounds, or with full 3D like Under a Killing Moon, held up much better.

True and there is this one scene in which GK does not seem to understand what another guy is saying even though they all speak German ....
It's been a while since I played it but iirc it was a mix of real objects, scanned pictures and scanned documents. I personally really liked this almost sureal setting. I guess it's subjective. Some would say that the full 3D environments in Tex mixed with FMV of characters in front of green screen is feeling strange as well. Imo the most important thing is that the atmosphere and story works which imo is the case in both examples. What I really adore in all GK games is how Jane Jensen was mixing true facts with complete fiction in such a way that it is hard for the uninformed player to say when the fact stopps and the fiction is beginning. I am still not really sure if King Ludwig was not a Werewolf after all ;)

It never really looked all that great; at the time it was released critics noted it visually was not as good as some of the other FMV games coming out.
FMV is interesting because in the mid 90's, when computers reached the point where they could handle FMV,many game companies thought it was the Next Big Thing and invested a lot of money into it; Sierra games even built a studio , where as most game companies just rented studio space. But they simply did not sell well, part of the reason was being the subject matter for FMV's was limiting and the need for changing CD;s created problems. It was pretty much dead by 2000;and even the replacement of CD's by DVD's ,which solved the changing CDs problem,did not revive it.

It's funny because Myst and Riven were such successes, and even some others like 7th Guest and Phantasmagoria sold very well if I recall correctly. Also others like Under a Killing Moon are now considered classics. I don't think the genre itself couldn't connect with consumers, but more that the games made after that maybe weren't compelling? Or the companies were mismanaged, which was and is still a huge problem with the gaming industry.

Adventure games themselves faded from popularity around the same time, and FMV isn't as useful for FPS and RPG games, which might also be a factor. As for why the adventure genre faded... well, we could brainstorm all day.

I just checked and didn't see anything on WSGF or PCGW, which usually means nobody's got anything to work beyond what a game supports by default, or nobody's documented it yet. For an old game like that however I'd presume it is very limited to what it supported originally.

That's part of the nostalgia for older games for me so I don't generally mind it so long as the gameplay is good and the overall experience is enjoyable. It's a walk down memory lane. :)

Also FMV kinda remind of VR today where it might be enjoyable for a little while and a novelty for one or two games but it is easy to tire of it quickly. It's a gimmick. And with FMV games you realized that outside of the best FMV games that you weren't playing a very good video game and you weren't watching a good movie. VR today is facing the same issue to a lesser extend.