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The perception of flicker by the human eye depends upon the picture content, and this paper describes a relation between the critical flicker frequency and the spatial frequency . Provided that the visual picture is presented in such a way that each spatial component, presented at a frequency , obeys the inequality , no flicker effect is perceived. The constants and are weakly dependent upon the brightness and picture area; they are a little more strongly dependent upon the contrast ratio and the type of picture. The effect can be exploited in motion pictures or television by presenting high-quality pictures interleaved with low-quality ones. In the latter, some high spatial frequencies would be omitted. For television, band reduction of a face by 9:1 is possible. Practical consideration may reduce this compression ratio to a little short of 2:1.