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There are two ways of dealing with this problem, having different pros and cons.
With clipping any values in the target that are brighter than the monitor can display instead use the brightest displayable value. This results in all values below this threshold being correct, but brighter colours being distorted.
With scaling the brightness of the target is reduced so that the relative brightness of all output colours are correct, but the absolute values will be darker than the target profile.
Often this problem occurs when the monitor physically can't display colours as bright as requested (such as trying to match an LCD display on a CRT). However sometimes increasing the monitor brightness and re-profiling can fix this. In particular this can occur when using a dark target profile when profiling with cineProfiler. What happens is that the cineProfiler tells the user to reduce the global brightness of the screen down to match the target requested. If the screen is re-profiled using a brighter target profile (or so that the brightness levels match at higher than 0 in the profiler) these clipping errors may go away.
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