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Introduction
Recently I have been working on a project, where a certain task's completion needs to be visually indicated in some graphic way. I settled on creating a style for the ProgressBar control, with a changing background color depending on the current value of the ProgressBar.
HSV (Hue-Saturation-Value)
From Wikipedia :
"HSL and HSV are the two most common cylindrical-coordinate representations of points in an RGB color model, which rearrange the geometry of RGB in an attempt to be more perceptually relevant than the cartesian representation."
HSV is a different way of representing a color (as opposed to RGB, where R indicates a value from 0 to 255 that "controls the amount of red", G for green and B for Blue). Have a look at the link above for an in-depth discussion.