Creating image of diagram without description or padding in addin

I want to know how edit settings in EA programmatically in an addin.

I already have a functioning addin, which creates a new image of the diagram each time it is changed, overwriting the old version. this is done in C# via this command:

    projectInterface.PutDiagramImageToFile(GUID, path, 1);

This looks like this:

However i want an image without padding and without the box in the upper leftmost corner, like this:

while this can be done by editing the settings, i want to persist the users settings, meaning that i will probably do the following:

1. Record the setting
2. Edit the setting
3. Create the diagram image
4. Edit the setting back to the original

so... How do i edit these settings? (preferences -> diagram -> diagram frames -> printed images AND diagram padding)

Ideas are also more than welcome :)