There is going to be an official Blu-Ray release from Warner Archive that has new 4K transfers of the shorts sometime this year. Most prints of the Superman shorts are really bad duped 16mm prints or 8mm home movies
Supposedly these shorts are in the public domain so WB hasn’t been interested in releasing them in HD, until the forthcoming Blu-ray next month. But there are many gray market releases of these cartoons on DVD, from who knows what sources. These versions are freely available on YouTube etc. WB themselves put out SD versions as bonus features on the Superman The Movie bluray.
Are there any unofficial HD scans from film prints or just weird DVDs?