How to relate a variable?

Coding Python Support
1

I watch a blender video tutorial. here : https://www.youtube.com/watch?v=wDzTcqRKxy0
There is a Filter 2D by script.

And i was tuning a script such as below.
How to relate a variable?

How to relate a variable.jpg1920×1040 514 KB

See file : http://shshop.da.to/tmp/Game%20Emit%20Texture1.blend

Please answer to me.
Thank you.