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The bulk of the data might be in the middle of the histogram, but the brighter stars are not. If you use Astro Pixel Processor, the histogram display relates to the current preview window. If you display a typical image and use the linear histogram display, the histo will probably be somewhere around the middle, but if you zoom in towards an even moderately bright star the histogram will shaft significantly to the right.
I have wondered more than once if the vibrant star colours you more often see out of a CCD is related to the anti blooming gate sensors that many astro cams seem to use (The typical KAF8300 being the workhorse) The anti blooming gate by my reading will essentially make the sensor less linear at the top end of the pixels range, basically the more accumulated charge, the less sensitive the pixel is so stars would be less inclined to saturate than in a CMOS camera of the same full well capacity.
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