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Adobe Photoshop Help

 

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To specify the lasso’s sensitivity to edges in the image, enter a value between 1% and 100% for Edge Contrast. A higher value detects only edges that contrast sharply with their surroundings; a lower value detects lower-contrast edges.

To specify the rate at which the lasso sets fastening points, enter a value between 0 and 100 for Frequency. A higher value anchors the selection border in place more quickly.

On an image with well-defined edges, try a higher width and higher edge contrast, and trace the border roughly. On an image with softer edges, try a lower width and lower edge contrast, and trace the border more precisely.

To change the lasso cursor to indicate the lasso width, press the Caps Lock key on the keyboard. Change the cursor while the tool is selected but not in use.

If you are working with a stylus tablet, select or deselect the Stylus Pressure option. When the option is selected, an increase in stylus pressure will cause the edge width to decrease.

While creating a selection, you can press ] to increase the magnetic lasso edge width by 1 pixel; press [ to decrease the width by 1 pixel.

Using the magic wand tool

The magic wand tool lets you select a consistently colored area (for example, a red flower) without having to trace its outline. You specify the color range, or tolerance, for the magic wand tool’s selection.

Note: You cannot use the magic wand tool on an image in Bitmap mode.

To use the magic wand tool:

1Select the magic wand tool .

2In the options bar, specify whether to add a new selection , add to an existing selection , subtract from a selection , or select an area intersected by other selections . The magic wand cursor changes depending on which option is selected.

3For Tolerance, enter a value in pixels, ranging from 0 to 255. Enter a low value to select colors very similar to the pixel you click, or enter a higher value to select a broader range of colors.

4To define a smooth edge, select Anti-aliased. (See “Softening the edges of a selection” on page 166.)

5To select only adjacent areas using the same colors, select Contiguous. Otherwise, all pixels using the same colors will be selected.

6To select colors using data from all the visible layers, select Use All Layers. Otherwise, the magic wand tool selects colors from the active layer only.

7In the image, click the color you want to select. If Contiguous is selected, all adjacent pixels within the tolerance range are selected. Otherwise, all pixels in the tolerance range are selected.

Using the Color Range command (Photoshop)

The Color Range command selects a specified color or color subset within an existing selection or an entire image. If you want to replace a selection, be sure to deselect everything before applying this command.

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Adobe Photoshop Help

 

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To refine an existing selection, use the Color Range command repeatedly to select a subset of colors. For example, to select the green areas in a cyan selection, select Cyans in the Color Range dialog box, and click OK. Then reopen the Color Range dialog box, and select Greens. (The results are subtle because the technique selects parts of colors within a color mix.)

To select a color range using sampled colors:

1Choose Select > Color Range.

2For Select, choose the Sampled Colors tool .

3Select one of the display options:

Selection to preview only the selection as you build it.

Image to preview the entire image. For example, you might want to sample from a part of the image that isn’t on-screen.

To toggle between the Image and Selection previews in the Color Range dialog box, press Ctrl (Windows) or Command (Mac OS).

4 Position the pointer over the image or preview area, and click to sample the colors you want included.

Sampling color

5 Adjust the range of colors using the Fuzziness slider or by entering a value. To decrease the range of colors selected, decrease the value. The Fuzziness option partially selects pixels by controlling the degree to which related colors are included in the selection (whereas the Tolerance option for the magic wand and paint bucket options increases the range of colors that are fully selected).

Increasing Fuzziness expands selection

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Adobe Photoshop Help

 

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6 Adjust the selection:

To add colors, select the plus eyedropper, and click in the preview area or image.

To remove colors, select the minus eyedropper, and click in the preview area or image.

To activate the plus eyedropper temporarily, hold down Shift. Hold down Alt (Windows) or Option (Mac OS) to activate the minus eyedropper.

7 To preview the selection in the image window, choose an option for Selection Preview:

None to display no preview in the image window.

Grayscale to display the selection as it would appear in a grayscale channel.

Black Matte to display the selection in color against a black background.

White Matte to display the selection in color against a white background.

Quick Mask to display the selection using the current quick mask settings. (See “Creating temporary masks in Quick Mask mode (Photoshop)” on page 278.)

8 To revert to the original selection, hold down Alt (Windows) or Option (Mac OS), and click Reset.

To select a color range using preset colors:

1Choose Select > Color Range.

2For Select, choose a color or tonal range. The Out-of-Gamut option works only on RGB and Lab images. (An out-of-gamut color is an RGB or Lab color that cannot be printed using process color printing. See “Color gamuts (Photoshop)” on page 91.)

3Click Selection to display the selected areas in the preview area.

4To preview the selection in the image window, choose an option for Selection Preview:

None to display no preview in the image window.

Grayscale to display the selection as it would appear in a grayscale channel.

Black Matte to display the selection in color against a black background.

White Matte to display the selection in color against a white background.

Quick Mask to display the selection using the current quick mask settings.

(See “Creating temporary masks in Quick Mask mode (Photoshop)” on page 278.)

5 To revert to the original selection, hold down Alt (Windows) or Option (Mac OS), and click Reset.

Note: If a message appears stating “No pixels are more than 50% selected,” the selection border will not be visible. You may have selected a color, such as red, when the image didn’t contain the fully saturated color.

To save and load color range settings:

Use the Save and Load buttons in the Color Range dialog box to save and reuse the current settings.

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