ウィンドウスキンの代わりにメッセージの背後に画像を表示する – GALV_MessageBackground.js

Galv's Message Background
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Set the variable ID number you would like to use in the settings.
This is the in-game variable that you wil change with "Control Variables"
event command. (Default is variable 1, which has a value of 0 by default)
This will select images from your project's folders:
/img/system/msgimg_X.png - where X is the variable's value

You can also set a switch ID in the settings. If you choose a switch, then
during the game you can turn that switch number ON with "Control Switches"
to disable the background image and go back to using default windowskin.
This defaults to 0 meaning do not use this option.

This 'Show Message' settings of "window", "Dim" and "Tranparent" have an
effect on the message background image. Window shows image normally, Dim
shows the image partially transparent and Transparent makes it invisible.