Snagit cropping / trimming

Hey guys,

I am trying to have an VBA script open a certain JPG file, crop it and then safe it.

So far I got this:

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All goes well unless the S.ImageTrim.Bottom command. I don't understand how to implement it correctly.

Thanks in advance.

To be more specific. It does not need to be done by using snagit. What I am aiming for is the following: I would like to resize and crop and save under another name a large amount of JPG files in a loop function. Any suggestion is welcome.