===== Client-side measurements =====

The PMA.start viewer offers the tools to measure length and area in the digital slide, in the corresponding menu on the right side of the interface by clicking on the little ruler icon:
 - Line: you can measure distances between points in the slide
 - Area: you can measure surface area of an enclosed polygon in the slide
{{ ::pma.start_measurements.jpg?600 |}}

To begin measuring you simply
  - Click on the tool you want Line/Area
  - Start clicking on the slide to create a line/polygon above which you can see the live measurement
{{ ::pma.start_measuringjpg.jpg?400 |}}

==== Units ====
The units displayed by the measure tools are physical i.e. mm/cm/μm for lengths and mm^2/cm^2/μm^2 for area **except** when the slide format has no associated resolution information, then the units are pixels and pixels^2 respectively