Users adjust the controls until they're pleased with the picture they're looking at.
Similar controls can be found elsewhere. In many cars, for instance, drivers can adjust their seats electronically or manually using a variety of controls. One controls pitch, another height, and yet another the horizontal position of the seat. Stereos have complex equalizers that raise or lower the audible impact of sounds in a certain set of ranges. Users often encounter a plethora of engineer-friendly, detailed settings mechanisms that give control over the minutia of a product.