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
Hi Zach, I know I am coming in at the tail end of your list of comments, but what the heck.... You produced such a beautiful, neat and efficient little tutorial, you deserve a medal! Like with others it saved me oodles of time and enabled me to calculate the actual air flow surface of a cast iron grid which consists of lots of irregular shapes. Sooo easy thanks to you.... :):):)
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.
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.
@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.
This is a really helpful tutorial. I had never thought of using Photoshop in this way. Presumably, using similar tools it must be possible to calculate brightness (luminescence) or colour intensity of a given region of interest. Any thoughts on this?
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
is there any possibility to calculate in the micro level. Because I don't no how to compare my pixels to a real digits!I will be thanksfull if you could give me some advise!
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.
Hi Zachjarou Great guide! I do however think that Adobe Photoshop is very complicated to use for a task like measuring a leaf area. Take a look at "KLONK Image Measurement. If measurements are done regulaly, it is a lot faster to use our software. No need to make it into rocket science. Simple import an image, calibrate by measuring a known length, and now you are ready to measure area. perimeter and length all you want.
I'm happy to hear that this technique has been applied to a number of different topic areas. Thank you for sharing your successes!
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
Hi Zach, I know I am coming in at the tail end of your list of comments, but what the heck.... You produced such a beautiful, neat and efficient little tutorial, you deserve a medal! Like with others it saved me oodles of time and enabled me to calculate the actual air flow surface of a cast iron grid which consists of lots of irregular shapes. Sooo easy thanks to you.... :):):)
+Karlheinz Bohm Glad you found it helpful!
Thank you! Measuring areas with Photoshop is really handy, and by following your tutorial it was pretty easy as well.
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.
This is going to make my project in linear discriminant analysis way better than it would have been. Thanks!
This really helped me in calculating the total land area vs ocean area in a map of mine! Thanks
Thank you! Thanks a lot for all your detailed information. You were a great help to me.
hi zach, i would say thankyou for your tutorial. it's very helpful
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.
Hugely helpful, especially since ImageJ let us down. Thank you so much!
i think so too. i was using imageJ to measure but not that great like this method
Thanks
I managed to suss it out by adapting this tutorial.
I had some known measurments within the photo.
Glad that you found it useful!
This is so clever. I'm curious, has this method been applied in any actual scientific publications?
@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.
This is a really helpful tutorial. I had never thought of using Photoshop in this way. Presumably, using similar tools it must be possible to calculate brightness (luminescence) or colour intensity of a given region of interest. Any thoughts on this?
Hai Jarou
Thank you very much for an excellent tutorial.
Great helpful
Really thought this was an excellent tutorial.
How would I use photoshop to measure land area from an aerial photo?
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
What about all those overlapping leaves?
Thank you my friend this is awesome!! I might get a job thanks to this, to u! :)
Man, this was a HUGE help! thx! (I'm really amateur in ps:)
what about LAI? plz share tutrorial in photoshop thx
I know that it has been used but I'm not sure if it has been explicitly referenced.
is there any possibility to calculate in the micro level. Because I don't no how to compare my pixels to a real digits!I will be thanksfull if you could give me some advise!
This is so helpful. I will use this technique to measure staining in C. elegans. Thanks for sharing. :)
I'm glad that so many people have found this technique useful for purposes that I wouldn't have initially thought of! Thank you for the feedback!
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.
It was really helpful one
Can this be applied to obtain a persons height?
Hello sir I am doing study on measument of interdental papilla can you guide
haha , you just confirmed my hunch , thanks a ton :)
I'm glad that you found it useful. Be sure to add it to your favorites & give me 5 stars!
Hi Zachjarou
Great guide! I do however think that Adobe Photoshop is very complicated to use for a task like measuring a leaf area. Take a look at "KLONK Image Measurement. If measurements are done regulaly, it is a lot faster to use our software. No need to make it into rocket science. Simple import an image, calibrate by measuring a known length, and now you are ready to measure area. perimeter and length all you want.
@zachjarou Thanks! Appreciate it :)
Thank you!
helpful thank you^^
Cool, tanks.
Thank you!! I'll buy you a ferrari