Rails 3.1 Asset pipeline - Why my images do not precompile for production?

Question

When running:

rake assets:precompile:all RAILS_ENV=production RAILS_GROUPS=assets

Everything precompiles but not my /app/assets/imag

Answer 1

Found a solution: Add to environment/production.rb

config.assets.precompile += %w[*.png *.jpg *.jpeg *.gif] 

Why isn't this default ;ike this line says: (application.js, application.css, and all non-JS/CSS are already added)

Answer 2

Use this format for the server:

rails assets:precompile:all -e production