When using extract pixels it seems that only content is extracted that starts from the origin and ignores the negative part of the axis. This is currently an issue for me as my indoor map is (approximately) centered at (0,0); So it will always reside partially in the negative coordinate areas. The container holding the map (a sprite with scale.y =-1 and some position offset) and some other shapes (graphics) live in the pixi.viewport container (awesome plugin btw
) and my first guess was that temporarily shifting the position of the viewport might help but I think this transform is somehow only relative to the stage. When passing the stage to extract, the result is just all black 
Thank you very much