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The Color Picker provides a non-modal method for exploring color space on various elements. The Color Picker is essentially a global service that can be used by tools and item control alike. The current "client" of the Color Picker is determined by selection order. If you select a Material Item, the Color Picker will be communicating with that Material so that you can use it to set any of the base colors (Diffuse, Specular, Reflection, etc). If you choose a tool like the Airbrush that allows color input the Color Picker will service that tool. If both a Material and color ready tool are selected, the most recently selected will take precedence.
At the top of the Color Picker are a number of adjacent "cells". These are used when the current Color Picker client can accept multiple colors. Once again we will use the Material Item as an example. With the Material Item selected, the first 6 cells become white. These cells represent the following color settings (in this order): Diffuse, Specular, Reflection, Transparent, Subsurface and Luminous color. Clicking a cell makes it the active setting and any clicks or drags in the color area will set that attribute with the selected color. Next to the cells is a small button labeled "S". This is the Swap Color button which will swap the current colors (or cycle them in the case of clients with more than two color cells). This is a very useful option when working with painting tools as it allows you to quickly swap the foreground and background colors. There is also a tool specific keyboard shortcut ("S") so that you can toggle these colors when using tools such as the Airbrush and Paintbrush.
At the bottom of the Color Picker are two horizontal ramps. The first sets the brightness for the current color and the second (checkered one) sets the alpha amount.
Keyboard Shortcut :
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Menu Path :
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