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Using the color table to edit colors and assign transparency


    You can edit colors in the color table to produce special effects, or assign transparency in the image to a single color in the table.

To edit colors in the color table:

  1. Open the indexed-color image.
  2. Choose Image > Mode > Color Table.
  3. Click or drag in the table to choose the color or range of colors you want to change.
  4. Choose a color, as explained in Using the Adobe Color Picker, and click OK.
  5. If you are changing a range of colors, Photoshop creates a gradient in the color table between the starting and ending colors. The first color you choose in the Color Picker is the beginning color for the range. When you click OK, the Color Picker reappears so that you can choose the last color in the range.

    The colors you selected in the Color Picker are placed in the range you selected in the Color Table dialog box.

  6. Click OK in the Color Table dialog box to apply the new colors to the indexed-color image.

To assign transparency to a single color:

  1. Choose Image > Mode > Color Table.
  2. Select the eyedropper, and click the desired color in the table or in the image. The sampled color is replaced with transparency in the image.