Creating a gradient mask
In addition to using black to indicate what's hidden and white to indicate what's selected, you can paint with shades of gray to indicate partial transparency. For example, if you paint in a channel with a shade of gray that is at least halfway between white and black, the underlying image becomes partially (50% or more) visible.You'll experiment by adding a gradient (which makes a transition from black to gray to white) to a channel and then filling the selection with a color to see how the transparency levels of the black, gray, and white in the gradient affect the image.
| 1. | In the Channels palette, click the New Channel button ( ) at the bottom of the palette to create a new channel.The new channel, Alpha 1, appears at the bottom of the palette, and the other channels are hidden in the image window. | | 2. | Double-click the Alpha 1 channel and type Gradient, then press Enter (Windows) or Return (Mac OS) to rename it. | | 3. | Select the Gradient tool ( ). | | 4. | On the tool options bar, click the arrow to display the gradient picker and select the Black, White gradient if it is not already selected. (Use tooltips or another view option in the gradient picker palette menu if you are unsure which thumbnail represents this option.) Then click outside the picker to close it. | | 5. | Hold down Shift to keep the gradient vertical, and drag the Gradient tool from the top of the image window to the bottom of the window.The gradient is applied to the channel. |
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