Add histogram exploration
Issue #15
resolved
I suggest adding another interactive plot, actually the simplest: histogram. Selecting intervals in the histogram would highlight involved pixels in the image. Best (but not blocking) if interactive stretching were also provided.
In fact, this tool would be the 1-dimensional version of the scatterplot.
Comments (5)
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repo owner
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repo owner
- changed status to resolved
added new histogram plot type (resolves
#15)→ <<cset 7d0c3f2383e4>>
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repo owner
Done - depending on the renderer, you get different colors in the plot.
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reporter
I miss the same kind of interactive exploration as with the scatterplot: being able to select one or several ranges in the histogram
and get those values highlighted in the image. And the reverse (which I understand is harder), draw polygons in the image and get
the corresponding bars highlighted in the histogram. Also, as I suggested for the scatterplot
(https://bitbucket.org/janzandr/rasterdataplotting/issues/17/display-x-y-values)
browse the histogram to get the actual image value and its corresponding frequency.
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reporter
Also:
- There is no y-axis
- For an RGB image, I see only one histogram (unlike your example).
- In the case of images with many bands, it would be better to select those to be displayed.
- And I just observe an error message:
“File "C:/Users/1/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\rasterdataplotting\rasterdataplotting\gui\rdphistogramplotwidget.py", line 422, in onMapCanvasExtentChanged
self.plotData()
File "C:/Users/1/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\rasterdataplotting\rasterdataplotting\gui\rdphistogramplotwidget.py", line 357, in plotData
select, color = binSelections[i]
IndexError: list index out of rang”
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Ah, that’s funny. Me and a colleague talked about a possible 1d histogram plot type last week
We’ll implement this.