Tools and techniques allow visual media to be edited by superimposing a parameter adjusting mechanism on the visual media itself and adjusting parameter settings based on user input detected by the parameter adjusting mechanism. In a visual media editing application, the parameter adjusting mechanism is superimposed on visual media so that the user can keep his eyes on the visual media and so that the visual media itself is not obscured by other user interface controls and windows as the user edits it. The user sets control points on the visual media that act as a fixed reference points for subsequent user input. The parameter adjusting mechanism detects subsequent user input calculates new parameter settings based on that input.