SetColor can only darken an image but cannot lighten it. Is it possible to apply a custom shader or ColorFilter to a slot?
[Flutter]How can I change the brightness of a slot beyond 1.0 in Flutter?
It is currently not possible to set your own shaders or filters on the Paint used to draw attachments set in slots. The reason is that the meshes of multiple attachments across slots can be merged into a single mesh to vastly increase performance. If you need this functionality, please open an issue for it on the issue tracker and I'll see if it can be added in a sensible way.
Mario Thank you, I have posted a feature request on the issue tracker.EsotericSoftware/spine-runtimes2386