ImageMagick: How to change transparent background to a color?

Question

Given an input image sample.i.png with a transparent background :

How to convert its background into a file sample.o.png with background rgb(160,160,255), opacity 100% (or 1).

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Answer used:

convert source.png -background "rgb(160,160,255)" -flatten out.png 

Please +1 emcconville's answer !

Answer 1

From Mark Random's suggestion. Create a background image with your color, and flatten the source image over it.

 convert -size 150x150 xc:"rgb(160,160,255)" source.png -layers flatten out.png

Edit If you don't want to worry about image size, just change the background directly.

convert source.png -background "rgb(160,160,255)" -flatten out.png 

Add the -flatten to re-set the background color