Just my guess about this…

If you have a large image and you have resized it to be smaller, and use code 
or the inspector to lock it, that’s one variation. It could be that you at some 
point you want to show the image at its original size.

If you made it smaller and want to always have it at the smaller size, that’s a 
different case. Setting the imagedata of the image to the imagedata of the 
image will permanently resize it. It won’t needing locking to remain at that 
size.

I think the second option is rarely what you would want to do, because the 
scaling quality isn’t ideal. You would normally import the image at its 
intended size.
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