The default color mode when scanning is set to Automatic.
If you want to know how to change it follow these steps:
Open the menu and tap on "Settings". Scroll down to scan section until you can see "Default color mode when scanning" and tap on it
You can choose between the following default color mode: Automatic, Gray, Black/White, Original and Text.
Choose you color mode while you tap on it and confirm your selection with Done.
In our example we change the default color mode from Automatic to Black/White.