I know nothing about IM APIs, only the command line. but if you start 
with a png that has transparency in it and flatten onto a white 
background (into a jpg that allows no transparency) then the white 
spot you are seeing is likely from the transparency in the png image 
that you started with. It gets introduced by the flattening onto a 
white image. It is likely a transparent hole in the png image.

You can extract the alpha channel to see what it looks like via

convert image.png -alpha extract image_alpha.png


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