As you can see in Figure 4.18, reflections of lights and objects are visible in the ridges of the tiles on the building. These reflections lack detail due to the surface texture of the tiles and the limited area within the ridges. The reflections appear simply as tonal changes along the surface.
Figure 4.18 The reflections on the curved surfaces of the tiles.
To achieve this effect, I employed the Other Dynamics portion of the Brushes panel. This section controls the Opacity and Flow Jitter of a stroke.
I set the Opacity Jitter to Fade (Figure 4.19). I set an amount that would produce a stroke that was long enough to cover the area of reflection and then fade out to transparent as the reflection ended.
Figure 4.19 The Other Dynamics section of the Brushes panel where the Opacity Jitter is set.
Choosing a dark blue color, I clicked once at the bottom of the ridge to be painted (Figure 4.20). Pressing the Shift key to connect one click of the Paintbrush to the next click, I clicked at the top of the wall of tiles. The result, visible in Figure 4.21, was a stroke that slowly faded as it reached the top of the wall.
Figure 4.20 With a soft-edged, dark-blue brush tip, a single click is set at the bottom of the tiles to be painted.
Figure 4.21 The result is a streak that fades as it travels upward.
The tiles are slightly rounded at the edges. This rounded surface disturbs the reflection. To get this effect, I added a layer mask where I painted the stroke with black to hide the areas of the stroke that fell over the edges of the tiles (Figure 4.22).
Figure 4.22 The portions of the stroke that fall over the tile edges were hidden with a layer mask.