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:
- 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.
- 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 TypeInput LevelsOutput LevelsPatterned and mid-tone solids30, .6, and 2550 and 200Light-tone solids20, 1, 2550 and 230Dark-tone solids60, .4, 2550 and 200
- Save the resulting 8-bit grayscale image as a .PNG or .TIF file.
- In Image Authoring, Ctrl-click in the toolbar to see the View Properties dialog box.
- Click the Illumination tab, click the Action button for the Illumination Map you are editing (usually Map A), then select Load From File .
- 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.