In the communities, along with emotions, music, dance etc., colors are also missing from the community. Jonas and The Giver are the only citizens known to see colors. Jonas only began to see colors when the Giver gave him his first memories. The Elders saw colors as being dangerous because they kept people from sameness.
In the movie the absence of colors is shown by the movie starting out as black and white, the slowly each colour appears as Jonas discovers them.