Replace transparency in PNG images with white background

by 
-background white -alpha remove -alpha off

Example:

convert image.png -background white -alpha remove -alpha off white.png

Feel free to replace white with any other color you want. Imagemagick documentation says this about the -alpha remove operation:

This operation is simple and fast, and does the job without needing
any extra memory use, or other side effects that may be associated
with alternative transparency removal techniques. It is thus the
preferred way of removing image transparency.

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