I'm not sure, but maybe we have a Photoshop guru around here that can help.
I can say that you can export PSDs from Spine, so you could use Spine to apply tint black to an image. It's actually a really neat feature for drawing alternate images in the middle of an animation: export the current pose as a PSD with a layer per attachment, then in Photoshop you can easily redraw a layer for that particular pose.