What is "airbrushing"

Usage examples of "airbrushing".

The planet periodically became volcanically active, and the volcanoes spewed a fine mist of lava all over the landscape, airbrushing the glassy surface on a gigantic scale with vividly colored trace elements.

He had made his living tattooing, pinstriping cars and trucks, and airbrushing monsters and muscle cars onto T-shirts.