Discuss how to use the Ren'Py engine to create visual novels and story-based games. New releases are announced in this section.
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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
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?