How to measure leaf area in ImageJ program

This is the Reference of the ImageJ pro.
Schneider, C.A.; W.S. Rasband, and K.W. Eliceiri. (2012). NIH Image to ImageJ 25 years of image analysis. Nature methods 9(7): 671-675.

Keywords: Eggplant leaves, ruler, ImageJ
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Nashwan Yousif Eido
Lecturer in Plant Physiology
Horticulture Department,
College of Agricultural Engineering Sceinces,
University of Duhok, Zakho Street 38; 1006 AJ
Kurdistan Region, Iraq.
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[nikospapson]

Tommorow I have to measure the LA of 180 plants. This is so useful thanks!

[andrewmcc]

Hold shift when you're drawing a line on ImageJ. It will only make the line horizontal or vertical, no faffing about with angles

[nikolatesla]

The area result is 87.890 for first leaf. What does it mean? Is it mean the area of first leaf is 87.890 cm^3 and what are the meanings of "mean" "min" "max"? What do they show? Can you explain. Thanks.

[emtnanahmad]

What unit supposed used to express the total the leaf area? cm or cm^?

[hannahgentes]

Did there used to be audio? I can't hear anything

[appiahkubi]

Please I'm working on my project and I'm supposed to find the area that has been consumed by insect herbivores on some leaf samples but I'm struggling to perform it in imagej .. please can you kindly help me

[salah]

Thanks for this useful video. I follow it to measure leaves size but some of them give me NAN so the mean becomes NAN, do you have any idea why ?

[Daisychain]

Does this refer to the surface area of one or both sides of the leaf?

[Paoloforattini]

Hello, can you apply this to a database of pictures? Thanks

[harshasg]

Hi brother, can we measure the same in black background...?

[raghavdadhich]

Hi, how can I use pendent drop surface tension plugin for image j. Can you help me please.

[watchurwa]

what if there are holes in the leaves .. these are not outlined yellow.. are they still excluded?

[prajaktagaikwad]

how did u find distance in pixels in set scale

[HAN_Dynamic]

I use matlab. How can I do it in Matlab? Thanks.