Posted by
Michael Schmid on
Feb 18, 2015; 6:07pm
URL: http://imagej.273.s1.nabble.com/Measuring-RGB-average-values-in-an-ROI-tp5011644p5011669.html
Hi Jon,
for doing it manually, you can use for this, when you select the Red, Green and Blue channels.
To multiply with x, set the range to 0-(255/x), then press 'Apply'
As far as I know, Image>Adjust>Color Balance is not macro-recordable. In a macro, you would typically convert the image to Composite, manipulate the channels as desired, and convert back to RGB.
Michael
________________________________________________________________
On Feb 18, 2015, at 18:26, Jon Harman wrote:
> Hi Wayne,
> Thanks, that is easy. My next question is:
> Is there an RGB multiply macro or plugin that multiplys the RGB channels by different scalers and correctly deals with the 8 bit values, i.e. prevents going over 255.
>
> Jon
>
> On 2/17/2015 4:17 PM, Rasband, Wayne (NIH/NIMH) [E] wrote:
>> On Feb 17, 2015, at 6:52 PM, Jon Harman <
[hidden email]> wrote:
>>>
>>> Hi,
>>> Just checking if there is a simple way to get the average R,G,B values in a color image inside of an ROI. I know that I could split the image into R, G, B images then copy the ROI into each and calculate the average gray. That seems to be a pain. Is there anything easier?
>>
>> Use the Plugins>Analyze>RGB Measure command, which runs the MeasureRGB macro, available at
>>
>>
http://imagej.nih.gov/ij/macros/MeasureRGB.txt>>
>> Or convert the RGB image to a composite image using Image>Color>Make Composite and press “m”, “>”, “m”, “>” and “m”. “m” is the keyboard shortcut for the Anlayze>Measure command and “>” is the keyboard shortcut for Image>Stacks>Next Slice.
>>
>> -wayne
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