Posted by
Duane and Julie on
May 13, 2008; 10:39am
URL: http://imagej.273.s1.nabble.com/Filtering-certain-color-range-tp3696226p3696234.html
First of all, yes, you can filter a certain color range.
For your particular problem, I converted the image to L*a*b* space and
then used the a* channel.
The new image is now noticeably bimodal in the center of the histogram
with some spikes at either end. I thresholded the image to leave the
bimodal section and then drew a line for the profile. It seemed to be
effective.
If you were to spend more than the 60 seconds I did, you would
probably get pretty good results.
duane
On May 12, 2008, at 10:36 PM, rasheed wrote:
> Hi there everyone,
>
> I would like to know if it is possible to subtract or filter a
> certain color
> range. I have attached a photograph of a core(acquired while
> drilling the
> hole looking for oil). From the image, three different major
> features (in
> terms of color) can be seen, light brown, dark brown and gray.
>
>
http://www.nabble.com/file/p17182225/2010.00-2020.00%2Bm.jpg> 2010.00-2020.00+m.jpg .
>
> What I would like to do is to know the total height of the
> sand(light and
> dark brown) in the image removing the gray stuff which is shale/clay.
> Therefore, if I could filter the gray stuff out, I can then plot a
> profile,
> knowing that the low value(or black) is the shale/clay and the rest
> is sand.
>
> The problem I have now is, when I plot a gray scale profile, it will
> not be
> possible to differentiate the shale from sand as the shale seem to be
> brighter than the dark brown sand.
>
> Any advice on this matter is very much appreciated. Thanks guys/gals.
> --
> View this message in context:
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