Perimeter measurement

Posted by OlgaFishkis on Mar 05, 2008; 11:37am
URL: http://imagej.273.s1.nabble.com/Perimeter-measurement-tp3696992.html

Hello,
Could someone explain me please why if I measure a square particle 1x1 sq. px the values of the area is correct (1 sq px) but the perimeter is 2.8 instead of 4 px?
If I apply a macro to measure a convex hull of the same square particle I get  the right value of the perimeter - 4.
Thank a lot
Olga