Measuring Image Intensity

[kiwi139]

Hello all,

Basically, I have an image showing a blue and clear liquid partially mixed together. I want to be able to draw a line across the image and then be able to see a graph / table showing the colour intensity of blue across the image at any particular point across the line. Does anyone know if this is possible to achieve? I've had a play around with a couple of ImageJ plug-ins but to no avail.

Thanks,

Aaron Cain

[Joachim Wesner]

Hi AAron,

if you extract the blue channel by some means (the easiest would be "Colors
/ Split Channels", but there are more specific one, too),
you can draw any line across the blue channel and the plot the intensity
with "Ctrl-K"

Joachim




                                                                           
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Hello all,

Basically, I have an image showing a blue and clear liquid partially mixed
together. I want to be able to draw a line across the image and then be
able
to see a graph / table showing the colour intensity of blue across the
image
at any particular point across the line. Does anyone know if this is
possible to achieve? I've had a play around with a couple of ImageJ
plug-ins
but to no avail.

Thanks,

Aaron Cain
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[Li-Ping Yuan]

My guess is ...  Blue intensities are propably similar be
Aaron,

My guess is ...  Blue intensities are propably similar between blue area and white/clear area.  Red and green intensities should be low in blue area and high in white/clear area.  Try to find the red or green intensity changes.
 Li-Ping (Li) Yuan





________________________________
From: kiwi139 <[hidden email]>
To: [hidden email]
Sent: Tue, October 13, 2009 4:50:03 PM
Subject: Measuring Image Intensity

Hello all,

Basically, I have an image showing a blue and clear liquid partially mixed
together. I want to be able to draw a line across the image and then be able
to see a graph / table showing the colour intensity of blue across the image
at any particular point across the line. Does anyone know if this is
possible to achieve? I've had a play around with a couple of ImageJ plug-ins
but to no avail.

Thanks,

Aaron Cain
--
View this message in context: http://n2.nabble.com/Measuring-Image-Intensity-tp3819200p3819200.html
Sent from the ImageJ mailing list archive at Nabble.com.

[kiwi139]

Ah. I've managed to get this far! The graph produced appears to show areas of high intensity as low values and areas of low intensity as high values!? Is there a way of reversing this? Also can the data from the graph be transferred into table form? So I can move it into an excel spread sheet for example.

Regards

Aaron

[Jan Eglinger-5]

Hi Aaron,

kiwi139 wrote:
> Ah. I've managed to get this far! The graph produced appears to show areas of
> high intensity as low values and areas of low intensity as high values!? Is
> there a way of reversing this?
You can invert your image before plotting by "Edit>Invert"

White gives high values, black gives low values, unless you apply an
inverted LUT. You can mouseover the pixels and see the values in the
ImageJ status bar.

> Also can the data from the graph be
> transferred into table form? So I can move it into an excel spread sheet for
> example.
On the plot window, there is a "List" button that opens a text window
with all the plot values. Just save it as an xls file.

Best,
Jan