Convert product images to black background

Convert high resolution product images from existing white background to black. Images usually arrive with a resident work path, but these are not as accurate as we need so moderate levels of cleanup is required to exactly and cleanly show the items' true edges. Polygonal lasso and blur tool often go far in this endeavor. Total number of images 50 - 200 (or more). A new crop of images is available every six months. Please bid on a per-25 images basis.