A nice shot of Bahnsen in the Expos red alternative jerseys. The photography from this set combined with the design truly make it one of the most colorful sets ever.
As to my question in the title I think there are a couple of reasons the Donruss set is more colorful than todays Topps set.
1. I noticed when comparing the sets more players were photograph in their Dark uniforms in 1982 Donruss than their white uniforms.
2. The photographs were cropped tighter (more player on the card than other stuff) in the 1982 Donruss set giving you a clearer shot of the uniforms
3. The main reason, besides 1982 Donruss being a wonderful simple design, the uniforms back then were more colorful. With the advent of the 1970s, astroturf and everyone owning color television, MLB teams went wild on uniform schemes. The Oakland A's, San Diego Padres, Pittsburgh Pirates, Houston Astros, Montral Expos just had some 1970s far out uniforms. I think the early 1980s was the pinnacle of the these type of uniforms. By the late 1980s, the uniform schemes became more basic for most teams. In 1990, teams started to have throw back uniform games think of 1991 Topps Robin Ventura. The one team that is giving me that 1970s feeling are the Tampa Bay Rays there new dark uniforms have some pazazz.