Reference Manual - 1.4.11
IDirectFBVideoProvider   SetColorAdjustment

Adjusts the video colors.

DFBResult SetColorAdjustment (
  IDirectFBVideoProvider   * thiz,
  const DFBColorAdjustment   * adj
);

This function only has an effect if the video provider supports this operation. Check the providers capabilities to find out if this is the case.

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