Use the Wand tool.
Use the Color Range command.
Point to the object you want to edit. If the paint object is not in Edit mode, the pointer becomes a hand. Click the object to put the image in Edit mode. The pointer becomes a wand.
You can identify whether you are in Image Edit mode by the Status bar.
You can broaden or narrow the range of colors the Wand tool selects by adjusting its tolerance; e.g., a tolerance of zero selects pixels that exactly match the color of the pixel you click.
Use the settings in the Properties bar. In the Tolerance field, enter a tolerance value from zero to 255. The Select throughout image option lets you select the chosen color in the entire image. To smooth the edges of the selection, turn on the Anti-Aliased option.
You can use the Color Range command to select all areas of similar color in an image. The command creates a grayscale selection mask similar to an alpha channel.
You can use the Load and Save buttons in the dialog box to work with color range selection files. The file format that Canvas X Draw uses for these files is compatible with Photoshop Color Range files. On Windows, these files use the extension AXT.
Use this dialog box to select image areas based on color.
In the menu, choose the color (red, green, blue, cyan, magenta, yellow), or tonal range (shadows, midtones, highlights) you want to select.
To select a color interactively by clicking in the preview window, choose Sampled Colors.
When using the Sampled Colors option, enter a low value to select a narrow color range; enter a higher value to select a wider range.
Choose Selection to preview the selection, with white representing selected pixels, in the preview window.
Choose Image to see the actual image so you can sample colors with the dropper.
With Sampled Colors chosen, click the dropper in the preview window to select colors. Use the ‘+’ dropper to add to the selection; use the ‘-’ dropper to subtract from it.
Choose an option to preview the selection in the image itself, (or choose None for no preview). Grayscale shows the selection as it would appear in a channel, with white for selected pixels and black showing non-selected areas.
The Matte and Mask options show the original colors in selected areas. In non-selected areas, Black Matte shows black, White matte shows white, and Mask shows transparent red.
Use the Inverse command to simultaneously select all pixels not in the current selection while deselecting the current selection.
Choose Image | Select | Inverse.
A moving dashed edge surrounds the background, a selected area
When the selection is inversed, the cup and its contents are selected
The Grow and Similar commands let you expand selections to include similar colors in an image. These commands compare the colors outside a selection to the colors in the selection. Colors that are in a specified range of similar colors are added to the selection.
The range of colors selected by Grow and Similar is based on the Tolerance setting in the Wand dialog box.
To select similar colors throughout an image, you can also use the Select throughout image checkbox in the Wand dialog box.
Image after tapping Magic Wand on the indicated area and choosing Image | Select | Grow
Image after choosing Image | Select | Similar
You can repeat the Grow and Similar commands to continue expanding a selection. As more colors are added to the selection, more colors are in the range of colors similar to the selection. Therefore, even though the Tolerance doesn’t change, repeating Grow or Similar can expand a selection incrementally.
Grow and Similar can help you isolate elements in an image, such as dark objects against a light background. Select part of one dark object with the Marquee tool. Choose Grow to expand the selection to the entire object. Choose Similar to expand the selection to all similar colors in the image.