Final answer:
The first commercial film to use the three-strip process was "Flowers and Trees," released in 1932 by Walt Disney. The three-strip process was developed by Technicolor.
Step-by-step explanation:
The first commercial film to use the three-strip process was "Flowers and Trees," released in 1932 by Walt Disney. The three-strip process was developed by Technicolor. This process involved shooting the film with three separate black-and-white negatives, each capturing a different primary color (red, green, and blue). These three images were then combined to create a full-color image.