I tried controlnet in a few forms with some lettering, but wasn't able to get close to how they're doing it. Too often it will generate the subject matter into

I tried controlnet in a few forms with some lettering, but wasn't able to get close to how they're doing it. Too often it will generate the subject matter into the background too. Firefly's has really good separation usually. Maybe they're doing some kind of latent coupling, where the letter is a masked area and the prompt is applying purely to that masked area.