Measuring Leaf Area with Adobe Photoshop 3

[Blahah404]

Also you can make photoshop do the scaling more accurately, and avoid calculating each area yourself, by setting the measurement scale under the Analyse menu, then opening the 'Measurements Log' window and recording your measurements in the units of your choice.

[Blahah404]

Thanks for the tutorial. I have found that for some plant photos, especially of older plants where there is more variation in colour, it can be harder to accurately select the leaf area without including any soil artefacts. The way I work around this (with arabidopsis time-series photos) is by using the magic wand select tool (just hit W on the keyboard) and checking the 'contiguous' box, then holding shift and clicking all over the plant. The contiguous settings helps avoid artefacts.

[UncivilClown]

Can this be applied to obtain a persons height?

[zachjarou]

@UncivilClown If you have an object in the image of known height, you should be able to calculate the pixel distance along it's axis and use this to estimate the real world height of a person based on their pixel height in the image. Rather than using the histogram area tool, you'd probably want to use the "Measure Tool" located in the "Eyedropper Tool" submenu.

[UncivilClown]

@zachjarou Thanks! Appreciate it :)

[VampiricEmbrace]

This really helped me in calculating the total land area vs ocean area in a map of mine! Thanks

[lightray85]

hey..this tutorial was extremely helpful...i am a student of city planning and this helped me find the percentage of each landuse ( residential, commercial etc) in the landuse map of a neighbourhood...this would have been a tedious job in autocad, as the map was originally in jpeg format...thanks a lot

[zachjarou]

I'm happy to hear that this technique has been applied to a number of different topic areas. Thank you for sharing your successes!

[dangismed]

Thanks for this tutorial! I will be using a similar technique for droplet deposition patterns.

[N4Z1M]

You have just helped me so much thankyou.

Am using this to count chromosome telomere area in FISH images.

I knew something like this would exist, just didnt know how :p

[zachjarou]

Glad that you found it useful!

[brill0w]

What about all those overlapping leaves?

[kiskosid]

Really thought this was an excellent tutorial.

How would I use photoshop to measure land area from an aerial photo?

[zachjarou]

Are you just trying to measure the sizes of plots within the photo? Or measure the amount of plant growth within the plot? If you want to convert anything from a picture into real world units, you need to have something within the picture that you know the size of or know how big of an area is being captured by the aerial image at a given height.

[kiskosid]

Thanks

I managed to suss it out by adapting this tutorial.

I had some known measurments within the photo.

[bione1984]

Man, this was a HUGE help! thx! (I'm really amateur in ps:)

[zachjarou]

I'm glad that you found it useful. Be sure to add it to your favorites & give me 5 stars!