Hi Jack,
I am not sure about the error, but in your code you are overriding the Style property value of the Image. So the Height format will not be honored. To concatenate the formats in the Style property, I would suggest:
PlotImg.Style = {Height('6in'), HAlign('center')};
Or
PlotImg.Style = {Height('6in')};
PlotImg.Style = [PlotImg.Style {HAlign('center')}];
Also, I tried with a sample script and was able to align the image to the center using the HAlign format.
import mlreportgen.dom.*
d = Document('output','pdf');
image = Image(which('ngc6543a.jpg'));
image.Style = {Height('2in'), HAlign('center')};
append(d, image);
close(d);
rptview(d);
Thanks,
Rahul
