MATLAB: What property of a line is related to the transparency / opacity or alpha of a line

alphaopacitytransparency

when i plot a line with transparency by means of rgba color triplet and opacity.
hline = plot(x,y,'color',[1,0,0,0.5])
What property of the resulting handle is changed? I cannot find anything in the color triplet, nor can i find a seperate property like 'Alpha' or 'FaceAlpha' or anything similar.

Best Answer

This is an undocumented feature in MATLAB: http://undocumentedmatlab.com/articles/plot-line-transparency-and-color-gradient
You can access the alpha value using this line
alpha_val = hline.Edge.get.ColorData(4)
It is in uint8, you can convert to double
alpha_val = double(hline.Edge.get.ColorData(4))/255
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