Image processing on the canvas of Visual Novel Game

[SA10_UE5]

Hi guys!
I’m a beginner with Unreal Engine 5.

I’m trying to create a Visual Novel Game, referring to this link.

I want to apply image-processing into a canvas image on the game screen, like below.
[First image: Original, Second image: Applied image processing]

[Note: Please ignore VTuber’s illustration on bottom-right.]

But I don’t know how to do it, do you have any idea?

I make game by using mainly blueprint for now, can also implement C++ a little.

[SA10_UE5]

I make game by using mainly blueprint for now, can also implement C++ a little.

In addition, I can use OpenCV (C++) too.

[SA10_UE5]

Sorry, it seems easier to do it with Unity, so I will try that instead.
Therefore, this question might no longer be relevant.