Auto Scale will not work for me in Sketch Piture

Hi Everyone,

I have a series of photographs of a building which I need to use, there is a lot.

I need to scale these photos against known lengths so that the whole of the photograph will scale up correctly.

I know how to get the sketch picture into the window crrectly, but clicking on the auto scale at each end of the only makes the picture move.  If I lock the picture down then I loose the auto scale.

 

THis is so frustrating as I really need to get on with project of mine.

 

Can anybody tell me where I am going wrong.

 

Regards

 

Mike the n gauge guy