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Editing an Illumination Map in Photoshop

An Illumination Map is created automatically by Image Authoring when you create your vignette.
Image Authoring includes a number of tools to manipulate the illumination. You may want to fine-tune the Illumination Map using Photoshop, or a similar image editing application, if the image contains textures that need to be removed from renderable surfaces.
To Edit an Illumination Map in Photoshop:
  1. Open the original image in Photoshop or export the [Illumination Map] and any needed masks.
    Include any masks you need when editing the Illumination Map in Photoshop.
  2. Adjust the Illumination Map in Photoshop, using the imported masks as needed. For example, unless you have a grayscale image, you may want to do the following:
    • Choose Image > Adjust > Desaturate .
    • Choose Image > Adjust > Levels and change the Input Levels and Output Levels as shown in the following table:
      Image Type
      Input Levels
      Output Levels
      Patterned and mid-tone solids
      30, .6, and 255
      0 and 200
      Light-tone solids
      20, 1, 255
      0 and 230
      Dark-tone solids
      60, .4, 255
      0 and 200
  3. Save the resulting 8-bit grayscale image as a .PNG or .TIF file.
  4. In Image Authoring, Ctrl-click in the toolbar to see the View Properties dialog box.
  5. Click the Illumination tab, click the Action button for the Illumination Map you are editing (usually Map A), then select Load From File .
  6. Choose the illumination file you saved in Photoshop, then click OK . You can also try using the [Edit Image in Photoshop] button on the toolbar.