[Pharo-users] JPEG export producing images with black background

I need to export JPEG images in Pharo to later import then in my PDF document. When I export JPEG files with Pharo, the background is black, which makes the exported image meaningless. To reproduce the problem, do the following in the latest moose image (the image can be obtained from here<https://ci.inria.fr/moose/job/moose-latest-dev-4.8/> ): |window| window := ESExamples new kiviat2. window model canvas imageForm writeJPEGfileNamed: 'fileName.jpg'. The file will be produced in the image folder. If someone could suggest how to make the background white or transparent, it'll be a great help. Usman