vignette, with luminance consideration
-> the sun is still bright. in reality, the sun would probably "shrink" a bit as well, because of the border becoming less bright (at least i think so... ), but i guess this is impossible to achieve...
it's just a suggestion, but maybe it would be useful to have some settings for that included in the vignette effect...
EDIT: The darkened border seems to be a little oversaturated... If you don't like it, use this line instead. It now uses the luminace to mask the vignette:
This is in fact how a camera lens works (and many vignette effects you can apply in photo software, like Adobe Lightroom, also have highlight control) The grayed brights that happen with the current vignette looks terrible and are the only thing that stops me from using the effect.
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