I experienced a problem with ROI selection when scaling the image from
which to select the data from. In the source file *ROI.py*, line 2024/25
(*pyqtgraph
version 0.10.0*) there is a rather inconclusive exception call in the
getArrayRegion() method. Namely,
if br.width() > 1000:
raise Exception()
Using the following line I scaled the image resulting in values that were
obviously larger than that limit.
img.scale(x_scale, y_scale)
After scaling, I tried to retrieve the data in the roi as shown in one of
the examples:
def update():
global z, img, roi
arr = roi.getArrayRegion(z, img)
roi.sigRegionChanged.connect(update)
which resulting in the mentioned Exception. This only worked after
commenting out the mentioned two lines in the source files. I assume this
can be considered a bug because it worked also when I did not scale the
image.
Christian
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