The tones on the image can be enhanced and exaggerated by the use of extra layers. These layers are known as shading and highlight layers because of the effect they have on the scene. They are used to emphasise the shadows and highlights already present in the scene and produce a more three-dimensional result.  

Shading and highlight layers can be created which provide extra shading or highlight accents over the whole scene, or they can be restricted to selected areas only. If the whole scene is to be affected by the shading and highlight layers, no selection is required when they are created. If they are to be restricted to certain parts of the scene, the selection must be visible when the layers are created.

Adding shadows to a Texture Mapping Scene

1. Select all areas which require shading by dragging the selections from the Selections Palette into the file, holding down the Shift key to add them all together.
2. Make only the image visible and select Add Shading from the Grid Menu.
3. An 8 bit tonal layer will be created containing the shaded areas.
4. Double click on the word Layer, next to the new layer in the Layers Palette and rename it Shading.
   
   
5. View the shading layer on its own and on top of the image to see how natural it looks. 6 If the tones of the new layer are too light or dark, choose Edit > Gamma to change their depth and intensity. Try to keep the tonal range smooth so the shading on the layer still looks natural. Several shading layers can be created if necessary.

Adding highlights to a Texture Mapping Scene

1. Select all areas which are to have a highlight layer applied to them by dragging the selections from the Selections Palette into the file, holding down the Shift key to add them all together.
2. Make only the image visible and choose Grid Menu > Add Shading.
3. An 8 bit tonal layer will be created containing the shaded areas. At this stage the result and the method are the same as for adding a shading layer, so we now need to alter the information on the new layer.
4. Double click on the word Layer, next to the new layer in the Layers Palette and rename it Highlight.
5. Choose Edit Menu > Gamma, hold down the Control key on the keyboard and click in the Gamma Pane. The Gamma contextual menu will appear.
6. Choose Invert from the menu and you will see that the gamma line changes direction and the information in the selected areas of the file change to the opposite tonal values. Areas which were previously light become dark and vice versa.
   
   
7. Adjust the gamma to alter the tones of the highlight layer. You will probably need to remove quite a lot of tone to achieve a realistic look. Click Do Gamma when you are happy with the result.
   
   
8. Change the colour of the layer to white or off-white and reduce it’s transparency by clicking on the T button at the top of the Layers Palette and altering the percentage slider.  The transparency of the highlight layer will vary depending on the design.  In the example below it has been set to 87%.

The end result can look stunning, but it is important to note that we recommend assessing the colour of the shading and highlight layers in all colourways, as you may need to adjust the colour of them for each.

The Movie