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The color space found underneath the grid controls
The available color spaces are:
— HSV — HSL — HSY — HSP
Hue – Saturation Controls
As the name implies, the Hue-Saturation mode lets you alter hue and saturation simultaneously.
For most people, this is likely the most intuitive mode in which to work as the range of hues and saturation in the image is represented radially, just like the Vectorscope; in fact a Vectorscope graph of the image appears underneath the “wheel” grid of control points used to manipulate color.
By default, dragging any point of this grid changes the colors immediately surrounding that point that are between the point being manipulated and adjacent “spokes” of the radial grid that either aren’t influenced by that point, or are locked into place. In fact, you can pull these radial control points well past the boundary of adjacent spokes of the grid to warp those colors to entirely different hues.
The selected control point being adjusted doesn’t affect points on adjacent columns of control points that stretch from the outer ring to the center of this control, even when the dragged point is moved all the way past.
When manipulating control points to alter color, adjustments are similar to pushing color around a color wheel. Moving a control point radially around the circumference of the grid changes the hue of the colors corresponding to that control point. Moving a control point closer to the center desaturates those colors, while moving a control point closer to the edge of the grid increases the saturation of those colors.
The following sections describe how the different tools available in this mode work to let you manipulate these radial control points in different ways.