1. Create a new image in the Lab mode — say, 300 x 300 pixels, setting the Contents option to White.
2. Press D to return the default colors to the Toolbox. The foreground color is now black and the background color is white.
3. Press Ctrl+2. This takes you to the a channel.
4. Click the gradient tool in the Toolbox. Or press Enter. In the Options bar, select the Foreground to Background option from the gradient pop-up menu, select the Linear gradient style, and select Normal from the Mode pop-up menu. (See Chapter 6 if you need help using these controls on the Options bar.)
5. Shift-drag with the gradient tool from the top to the bottom of the window.
This creates a vertical black-to-white gradation.
6. Press Ctrl+3. This takes you to the b channel.
7. Shift-drag from left to right with the gradient tool. Photoshop paints a horizontal gradation.
8. Press Ctrl+tilde (~) to return to the composite display. Now you can see all channels at once. If you're using a 24-bit monitor, you should be looking at a window filled with an incredible array of super bright colors. In theory, these are the brightest shades of all the colors you can see. In practice, however, the colors are limited by the display capabilities of your RGB monitor.
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