Answered
Windows 10. x64
If I click File→export Image directly (same funtion with Ctrl+shift+U ?), this window show up. no place to change Scale (in cm) and Resolution (in dpi) . I learn from wiki, when I open this window ,it should be able to change those settings.
Is setting up scale and resolution not available in Version 6,or just my problem?
In Geogebra 5 offliine, It works in same computer ,I can change scale and resolution.
The same question 
In GeoGebra 6 the ExportImage command offers many options to customize the image that you want to export.
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