I often use Photoshop to create my own web icons and drawings, such as the one shown in the following illustration. In cases like this one, I can add a lot to otherwise flat-color drawings by painting in highlights and shadows. To see what I mean, compare the before and after view of a portal illustration for a marina, shown here on the left and right, respectively. The shadows and highlights around the rim of the hand-drawn portal were added by painting with black and white.
However, if I had just painted with black and white using the normal blending mode, the "highlights" and "shadows" would have been too harsh. Instead, to allow the highlights and shadows to properly blend with the image, I painted the highlights using the Screen blending mode and the shadows using the Multiply blending mode.
TRY IT To paint realistic highlights and shadows into an image, make sure the image is open and the layer on which you want to paint is currently selected. Select the Brush tool from the toolbox and pick an appropriately sized brush with which to paint.
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