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Pixel Intensity across specified vector?? Help!

Jul 25, 2013, 09:19
Post: #1
Pixel Intensity across specified vector?? Help!
Hi Gimps,

I have an image which i would like to measure the pixel intensity along a specific vector. I do not want the total pixel intensity for the entire image, i would like to draw a line, ie with the measurement tool and get a graph showing the pixel intensity as you travel along that line.

Anyone have any ideas?

Many Thanks!

P.S. Im a newbie here and with gimp!
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Jul 25, 2013, 11:08
Post: #2
RE: Pixel Intensity across specified vector?? Help!
ofnuts!

That looks about perfect.
I'll have a go at that.

Thanks

jspudross.
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Jul 25, 2013, 11:22
Post: #3
RE: Pixel Intensity across specified vector?? Help!
(Jul 25, 2013 11:08)jspudross Wrote:  ofnuts!

That looks about perfect.
I'll have a go at that.

Thanks

jspudross.

well you got a solution but maybe this for the future.

Starting in gimp to make a 1 pixel wide selection. The example is a diagonal, then rotated to the horizontal. A bit tedious but not difficult.

Then out of Gimp and into ImageJ which will chart the "grey values" along the line.

looks like this: http://i.imgur.com/zo0JPj7.jpg with everything on one screen.

The source image, the 1 pixel wide clip in Gimp,
ImageJ and the plot. The results as a text file.
The highlighted boxes show the transition of intensity from one pixel to the next pixels 443/444

** https://www.gimp-forum.net/ now answering questions**
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Jul 25, 2013, 12:43
Post: #4
RE: Pixel Intensity across specified vector?? Help!
Hi Rich2005

Thanks for that.

For anyone else interested.
Load image in ImageJ
Use the straight line selection tool and simply choose Analyse>Plot Profile.

Cheers to Rich and ofnuts

Jspudross.
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