Black and red overlay for flashing lights

[Godline]

Okay, this should be easy but I haven't done much with renpy is like over a year. Sooo...I'm looking to recreate a spooky emergency lighting effect. Like how it goes black and then goes red where you can sort of see stuff and then goes black again.

I mean I could do a night filter like this:
image bg ruin_path_night = im.MatrixColor("img/bg/ruin_path.png",
im.matrix.tint(0.5,0.5,0.6)
* im.matrix.brightness(-0.2))

(from viewtopic.php?t=24580)

But what about a red overlay and putting it together for that really jarring effect of when a place goes in full lockdown mode and nothing is working?

[gas]

On a previous attempt I simply created a red picture.

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image redpic = Solid((255,0,0,125))

Then created a transform

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transform alert:
    alpha 1.0
    linear 1.0 alpha 0.0
    linear 1.0 alpha 0.8
    repeat

And used it as a normal image

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show redpic at alert

That broadly worked for me.

[Godline]

Thanks so much! I'll try that now!