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I have a reference line retrieved from a raster image in the background that I know in real life measures 10 mm (l_ref). I want to scale the whole picture so that everything has real dimensions.
I use the measuring instrument to get the length (l_mes) then I do in my Mac shift+cmd+m scale proportionally and apply to each object separately 100/(l_mes/l_ref) %.
When I measure again the line has the same length, I don't understand why. Is there a better way?
The transform-panel modifies objects by setting a 'transform'-attribute on the object's internal XML-element. The measure-tool, however, doesn't take this attribute into account when calculating the length, meaning it displays the length the object would have without the applied scale (this is probably a bug).
What you can do is, either use the width and height input in the toolbar to manipulate the size instead, group your object by itself before scaling with the transform-panel then ungrouping it again, or use the 'Apply Transform' extension.
