When measuring for a tracking measure the outside width and depth of the window recess. The window will look taller if the track is positioned one inch above the window frame. Likewise, the window will look wider if the track runs slightly beyond the outside width of the window. To know more about panel blinds Sydney, via http://www.bestdealshutters.com.au/ .
Measuring for curtains
With regard to curtains look at what you are trying to achieve. Is it insulation, control of light, camouflaging an ugly view, privacy or simply decoration? If you have a stunning view through the window – emphasize this by dressing the window appropriately to the size of the room.
Measuring for Blinds
When measuring for blinds you will need to take into account whether you want the blind to fit inside or outside the window recess. If it is inside, measure the width and length of the recess.
If the blind will be fitted on the outside of the window recess measure the window recess and allow at least 3 inches on the width and length so that the blind isn't sitting half in and half out of the window. Austrian blinds are of a very fussy design with deep swags and frilled edges. Festoon blinds are made from lightweight fabric which is purely for show.
Roller blinds are a very simple design made from stiffened fabric attached to a spring loaded roller. Roman blinds are made from closely woven fabric either folding by itself or with slats of wood to create a more defined fold.