A suggestion: Make a scatterplot available, plotting the pixel-by-pixel values
of any two relevant quantities, and make it
possible to define a polygon mask on that scatterplot. That often allows
separation of chemically-distinct areas.
Sincerely,
Matthew Marcus
On 11/21/2019 12:26 PM, Matt Newville wrote:
HI Troy,
Sorry for the late reply -- I think this sort of slipped off my radar screen.
On Sat, Nov 16, 2019 at 2:09 PM E. Rasbury <troy.rasb...@stonybrook.edu
<mailto:troy.rasb...@stonybrook.edu>> wrote:
I have used larch some for XRF maps. I like the feature for defining ROI's
and then looking at the statistics of the data. I have some samples that are an
intimate mix of two or more phases and I would like to extract pixels based on
a criteria- like high Sr or low Fe, etc, from across a whole map region. I
wonder if this feature is available, or would be easy to create on larch?
Like you say, this is not currently available in the Mapviewer GUI. But it's a
good suggestion and might be possible to do with a small amount of code.
Would it work for you to say "Make an Area with all pixels where Sr Counts is above some
value"? I think that would be easy to generalize from "Sr Counts" to
"Ratio of ROI Counts" (or "analyzed concentration" once I get that done - a work in
progress). If that's right, I think it would be "not hard to add".
--Matt
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