On the Wikipedia page for Penny Serenade (1941, directed by George Stevens), there's a short section detailing a recent "AI colorization" of the film. Curious, I took a look. It looks about the same as colorization has looked for a couple of decades, now, which is to say it doesn't look very good at all except for in fleeting moments. It's in the wrong aspect ratio, too. This particular film is a prime victim for this sort of noodling because when the copyright came up for renewal 28 years after its release, Columbia Pictures neglected to renew it. Thus, it fell into the public domain. As a result, its presentation on home video usually has been awful, with countless editions available from fly by night video companies. Public domain is invaluable and necessary, but it is often a haven for philistines and grifters. Most PD versions of Penny Serenade are short five minutes of movie in addition to the usual defects. It's a shabby fate for a film that contains Cary Grant's first Oscar-nominated performance and a performance from co-star Irene Dunne that the actress herself felt was her very best. For what it's worth, the edition from Olive Films is excellent, sourced from primary materials and restoring the entire film. My screen caps for this post come from the Olive disc.
The story one finds in Penny Serenade follows the marriage of Julie Gardiner (Dunne) and Roger Adams (Grant), from their first meeting through tragedy after tragedy in which Julie loses her unborn child in an earthquake in Tokyo and becomes unable to bear another child. They adopt an infant daughter after a close inspection by the state, only to have her die of a fever. Roger loses the newspaper he owns, and the law refuses to allow them to adopt another child due to Roger's insolvency. Pleading with the courts. The shock is too much to bear. We meet them at the very end, as they are prepared to go their separate ways. The flashbacks that tell their story are keyed to music--they first meet in a music store where Julie works--and the film's vignettes are accompanied by well-known songs of the day (hence the title of the film).