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Old 21-09-2014, 03:32 PM
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RickS (Rick)
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RickS is offline
Join Date: Apr 2010
Location: Brisbane
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If you look at the CCDI data you'll see that, on average, the blue subs are less bright than the red and green subs (Background).

When the subs get stretched the blue ones need to be stretched further and the blue channel stars bloat giving a blue halo. It's the same reason that Hubble palette images have magenta star halos.

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