calculator between raster

[chrischris201444 at gmail.com]

Τη Κυριακή, 9 Οκτωβρίου 2016 - 11:55:54 μ.μ. UTC+3, ο χρήστης chrischr... at gmail.com έγραψε:
> any idea how to calculator rasters images ?like ((raster1+raster2)*(raster4*9)}
> for example.
> maybe is easy that question but i dont work again with raster and python
> i have gdal,numpy,scipy,pygeoprocesing and more

is easy to show me an example?i am very begin