Trying to figure out how Ren'Py works

[yummy]

Dug up into Ren'py libraries and found out that the Fade method could handle the whole overexposure effect.
Actually you could still use sub images in order to magnify the effect

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Fade(out_time, hold_time, in_time,
         old_widget=None, new_widget=None,
         color=None,
         widget=None,
         ):

The interesting parts in this effect are the in_time and the color parameters.

So if we play with this function:

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scene room normal
show room overexposed with Dissolve(0.2)
show white_image with Dissolve(0.2)
scene room normal with Fade(.5, 0, 3, old_widget=None, new_widget=None, color=(255,255,255), widget=None)

Hope that it helps

edit:
How can I use the config.say_sustain_callbacks variable?