public ImageRequestBuilder setPostprocessor(@Nullable Postprocessor postprocessor) {
    this.mPostprocessor = postprocessor;
    return this;
  }
Sets the postprocessor.

@param postprocessor postprocessor to postprocess the output bitmap with.
@return the modified builder instance
imagepipeline/src/main/java/com/facebook/imagepipeline/request/ImageRequestBuilder.java