Allows you to decrease the color depth of an image.
Example
Running this code will decrease the color depth of "E:\Example Folder\Picture 1.jpg" with an offset of "16", saving it to "E:\Saved Folder\Sample.jpg".
plugin command("Image Automation.dll", "image decrease colour depth", "E:\\Example Folder\\Picture 1.jpg", "E:\\Saved Folder\\Sample.jpg", 16)
