PQCT thresholding issues #28
Description
The method RoiSelector.getSieve throws an ArrayIndexOutOfBounds exception if it cannot find exactly one ROI. This happens if the user has set the thresholds incorrectly, i.e. low threshold is less than the minimun pixel value in the image, or hight threshold is higher than the max value.
In order to reproduce issue #27 needs to be solved first.