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Re: Totally new here. Color Counter question

Posted by Herbie on Oct 15, 2019; 10:39pm
URL: http://imagej.273.s1.nabble.com/Totally-new-here-Color-Counter-question-tp5022515p5022544.html

Good day Emily,

not sure if "white" can be detected or isolated in the same way...

As I wrote:
"Please make sure that you understand what the [...] processing means"

As with all tools, and ImageJ is a mighty tool, you should first study
the user manual. Here it is:
<https://imagej.nih.gov/ij/docs/guide/index.html>
There you find nearly everything you need except the "RGB >
CMYK"-converter plugin that you find here:
<https://imagej.nih.gov/ij/plugins/cmyk/index.html>
Download the "RGB_to_CMYK.class"-file and put it in the "plugins"-folder
of your ImageJ-installation.

Area measurements are made after thresholding (binarization) by "Create
Selection" and then using "Measure".

Please make sure you understand what color conversion and all the other
processing steps really mean. It is not a good idea to simply follow
step-by-step instructions (actually provided those before).

If you have studied the manual and still encounter problems with my
instructions, then please tell me exactly what works and what doesn't.

Regards

Herbie

::::::::::::::::::::::::::::::::::::::::
Am 16.10.19 um 00:08 schrieb Emily Teng:

> Dear Herbie,
>
> Thank you for the helpful comments and suggestions.  I understand what you are saying about arbitrary leaf overlap but for my purposes it is still meaningful information.  I need a good estimate of percent coloration of the overall plant.
>
> I only sent a pink and red example, and not a white example.  I assume the process would be the same?
>
> I am going to show my ignorance of the program as I don't know how to transform the picture to become CMYK.
>
> Step 2 - you say to "threshold the color channels according to the automatic "RenyEntropy"-scheme"  How do I do this?
>  
> Finally you say to that "After thresholding you can measure the selected area"  Again, I am just learning and don't know how to do this.
>
> I'm afraid I need step by step directions on how to do these things.  They sound simple enough.  Unfortunately I am totally new and don't know how to do any of it.  If you could possibly give some more step by step directions, I would really appreciate it!
>
> Emily
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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