Sign & Digital Graphics

November '18

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S I G N & D I G I T A L G R A P H I C S • November 2018 • 41 In the upper half of the Properties panel, or directly on the image, do any of the following: Adjust the color, intensity, and hotspot size. Each type of light source works a little differently but in general, dragging the ellipse encircling the lit area expands it or moves it. Dragging the intensity slider in the properties panel to the right increases inten- sity. In the lower half of the Properties panel, adjust the entire set of lights with these options: Colorize—tints the overall lighting. Exposure—controls highlight and shadow detail. Gloss—determines how much surfaces reflects light. Metallic—determines whether the light or the object on which the light is cast is more reflective. Ambience—diffuses the light as if it were com- bined with other light in a room, such as sunlight or fluorescent light. Choose a value of 100 to use only the light source, or a value of –100 to remove the light source or anything in between. Texture—applies a texture channel. A texture chan- nel uses grayscale images or alpha channels (called bump maps) to enhance the lighting effect and make it more three-dimensional. Multiple Lights You can add as many lights as you choose to create pictures with multiple light sources. To add a light, click on the desired light source icon in the Presets bar at the top of the interface. The new light source will appear in the Lights panel. Adjust its intensity and modify its characteristics. You can switch the light on or off by clicking the visibility icon in the Lights panel. If you want to adjust an individual light to make changes, choose the item in the Light panel or click on its marker on the image (see Figure 10). Lens Flare When a lens is pointed directly at a light source, there is often a reflec- tion of the light on the glass. This is called a lens flare that at one time was considered an undesirable effect to be avoided by photographers and film- makers. Nowadays though, lens flare is a bona fide technique in still pictures, film and video that is used to dramatize the intensity of a light source. Once again, it's always a good idea to duplicate the layer and convert it to a Smart Object so that adjustments can be made at any time. The opera- tion takes place in the Lens Flare dialog box (see Figure 11). Choose Filter > Render > Lens Flare, where you select a specific type of lens; there are four to choose from. You control the brightness of the flare with the slider and the position of the flare by dragging the little cross in the preview box. There is no live preview on the image with this filter. You'll have to view the edits in the rather small preview box. Clicking OK applies the filter to the image (see Figure 12A, B). Lighting is an extremely important element of the image. It is "ambi- ent content," which means that it is very much present but not noticed except subliminally where it makes a big impact. Lighting sets the mood and tells a big part of the story. Creating and altering lighting using these techniques increases your ability to enhance detail and create drama. Now, think about what brilliant effects that combining these techniques could potentially deliver. If you want to push the creative envelope and open the door to exciting new vistas, experiment with these lighting techniques. SDG Figure 11: The Lens Flare dialog box. Figures 12 A, B: Lens Flare produces the effect that the camera is looking directly at the light source.

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