This fascinating, provocative and quietly adversarial documentary examines the roles of blacks in prime time TV.

In a straightforward, informative manner, Mr. Riggs elicits opinions from the stars and producers of landmark shows in black television history, pausing occasionally for a well-chosen observation from James Baldwin's writings.

It's hard to fault any of this as ideological and social analysis, and Riggs should be credited for his willingness to be just as critical of more recent shows as he is of I Spy, Julia, and Roots.

Omissions aside, Color Adjustment provides enough footage and interviews that clearly show the early struggles for a voice in the medium.