A method for modifying a subtitle of a video frame. Subtitle text representing audio content of a video frame and font attributes of the subtitle text are received. A color of the subtitle text is identified, based on the font attributes of the subtitle text. A geometric region within the video frame corresponding to a display area of the subtitle text. A predominant color of the geometric region within the video frame is calculated. A level of similarity between the color of the subtitle text and the predominant color of the geometric region is determined. Rendering information of the subtitle text is calculated, based on the level of similarity, and a modification of the subtitle text is performed by applying the rendering information to the subtitle text, such that the modification reduces the similarity level during display of the video frame.