Allows you to change the alpha value of an image.
Example
Running this code will set the alpha value of the image "E:\Example Folder\Picture 1.jpg" to 50%, saving it to "E:\Saved Folder\Sample.jpg".
plugin command("Image Automation.dll", "image alpha", "E:\\Example Folder\\Picture 1.jpg", "E:\\Saved Folder\\Sample.jpg", 50)
