High dynamic range (HDR) allows us to capture an enormous range of luminance values within a still image or a sequence of video frames. But many consumers will not have the necessary displays to experience this in the near future. To allow these 'legacy' users to benefit, an adaptation using global tone mapping would be a possible solution. But the results tend to suffer from low subjective contrast and can product large-area flicker. To overcome these drawbacks, three enhancement steps are proposed. They are based on certain broadcast requirements as well as on viewer preferences, which were surveyed at the beginning of this study. The basic idea is to analyse each luminance value for its relevance in the image and discard unimportant ones. This 'virtual aperture' will be processed across the whole image and on image sections. Finally the tone mapping result will be composed with the chrominance values by using a modified IPT colour space.