mono/MonoGame — pull request #2057 by danzel (2013-10-05 00:22:37+00:00)
Title: Premultiply alpha on android when loading raw image assets

Otherwise image alpha is all wrong as you'd expect.

Have had @luisgabriel say this fixed it for him too over in a commit comment:
https://github.com/danzel/MonoGame/commit/e177f0a9f90cbee5fb6421ad004313bc2436baa4