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.
Thanks! The Mapviewer has an easy way to make a "Corrrelation plot" for two ROI maps. This includes a scatter plot of ROI1 + ROI2, the two individual maps of ROI1 and ROI2 and the joint map in two complementary colors. Users can draw a polygon mask on the scatterplot to highlight where different correlations appear. But right now, these are not saved as "areas" (masks that can then be used for XRF analysis or the sorts of statistics Troy was referring to). But that "scatterplot selection of pixels to area" would be pretty easy to add, and it makes sense to be able to save those selections. So, I will add that. Thanks for the suggestion!
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.rasbury@stonybrook.edu <mailto:troy.rasbury@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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