Photoshop How-To: Brushstroke Bonanza
Digital filters and plug-ins net only fair results when rendering the subtleties, depth, and complexities of watercolor. The secret to watercolor conversion that doesn't scream "Digital!" is to use brush strokes that mirror the motions of an artist's hand. My favorite watercolor media is the fine pen-and-ink drawing, loosely stroked with brushes full of color that layer life and light and shadow, yet leave an abstract feel with plenty of unpainted white space. It's sleek, dramatic, minimalist, and imaginative.
The inspiration for my watercolor-conversion technique, which my company uses for standalone wall art and as storyboard introductory material in our event videos, comes from two intriguing personalities: Karl Lagerfled's hand-colored fashion sketches for the House of Chanel metamorphose on the screen into breathing models, glamorously enfolded in texture and shimmering fabric. Celebrity interior designer Candice Olson fades her precision architectural renderings into finished interiors with the new furniture, lighting, and accessories all magically in place.
You don't have to be a celebrity to achieve these effects -- just follow my recipe for hand-painting delightful imagery directly in Photoshop. While my technique is far from automated, it requires no color mixing, no custom brushes, and once you get the feel of making strokes, it's almost as simple as a paint by number.
You'll need Adobe Photoshop, preferably CS2; a stylus and tablet; and a full-resolution 8-bit image that has been color corrected, cropped, and manipulated for photographic accuracy.
Step 1. Blur the Image
I chose a densely populated action wedding scene (Figure 1) to demonstrate how you can achieve very fine detail. Most images will be far simpler and less time-consuming to execute. For larger versions of all figures, click on the images.
Duplicate the image, and name the new layer "Blur."
Go to Filter> Blur> Smart Blur and enter settings that range from about 50 radius and 55 threshold to 40 radius and 60 threshold. Settings of 80/90 will be too sharp overall and 15/20 too blurry for faces. Choose High quality and Normal mode.
Create a layer mask and paint detail back into the image with the softest black brush, touched loosely over any details to be selectively preserved (Figure 2). On faces, use a brush setting of 50% Opacity and 50% Flow. Decrease that to 20/25% for open areas, and increase it when you want to assure visible detail, such as in the very delicate wedding dress.
Flatten the layer and save the file under a new name for safety.
Step 2. Create the Pen-and-Ink Drawing
Duplicate the blurred layer, which is now the background, and name it "Ink Drawing."
Go to Filter> Stylize> Glowing Edges and choose Width Edge, Brightness Edge, and Smoothness settings of 1, 12, and 3, respectively. Another typical setting variation is 2, 10, and 3. The trick is to make sure that edges are fine enough to show all complex detail. The pen and ink drawing will become the outline, making it easy to paint in the right place (Figure 3).
Invert the image (Command/Control-i).
Go to Image> Adjustments> Desaturate, then change the layer blend mode to Multiply. Reduce Layer Opacity slightly (here it's 80%), but not too much, or the pen and ink effect will dissolve into a more abstract, free-hand watercolor feel.
Step 3. Prepare the Watercolor Layer
Duplicate the blurred background layer and name it "Watercolor."
Invert the image (Command/Control-i), drag it to the top position, and change the blend mode to Color Dodge.
Step 4. Paint the Color Wash and Background
Using the Dry Media Brush, paint with black directly on the Watercolor layer you just created (Figure 4). The colors will appear from the lower layers in the stack. Make frequent snap shots so you can easily go back to previous stages. During this step, Medium magnification works best.
For foliage and the general scene, choose a brush setting of Opacity 30% and Flow 30%. Move your stylus freely, but smoothly and irregularly, leaving some white areas, especially at the edges, and covering others, such as the bushes, completely.
For skin, clothing, and delicate areas, your brush setting should be lower still, at about 20/25%. Be light with your brush!
Try to finish painting every object requiring Dry Brush before you move on. You can alternate between brushes, of course, but switching takes much more time.
Step 5. Paint the Fine Details, Texture, and Depth
Using the Watercolor Textured Surface Brush, paint with black directly on the same Watercolor layer. Set your magnification to high, and zoom in and out frequently to judge the results.
Your brush settings should be small, about 25% hardness, with the Opacity and Flow at 75% to 100%. Vary the stroke size and application so that they're visually appropriate for each object.
Stroke loosely, bouncily, lively, almost scribbling. Paint hair and clothing patterns with curlicues or squiggles. It will look more real if you don't color totally within the lines (Figure 5).
Tip: Layer strokes several times to create depth, dimension, and shadow, just like the watercolorist loads her brush, overlaying and changing the mix of color and water. Use a white brush to soak up some color and make an area scratchy or more edgy, as watercolor would normally appear.
Step 6. Complete the Final Touches
Use the Eraser tool to clean up the image's edges, making sure there's enough white space for that authentic watercolor look.
Restore small things that have disappeared, such as the light bulbs in the sample image. I restored them by painting with a warm gold color, 100% Opacity and Flow, using a tiny, irregular swipe for each bulb.
Darken the whole image (using your choice of Levels or Curves), adding a bit of Saturation for visual intensity. You may also want a slight corner darkening, as I did, for greater impact (Figure 6).
Figure 7 shows the final results.
Figure 7. We used the final pen and ink watercolor in a concept event video as part of a 12-image storyboard. Each watercolor fades into the original photo depicting an iconic stage of the event. To see a larger version, click on the image.
Think about the real texture of objects in the image as you make strokes. You're just selectively coloring in between the lines to reveal the meaning of the original, but with a handmade flavor any traditional watercolorist would envy. Use as few or as many strokes as you like. You can hardly make a mistake!
Sara's technique was inspired by husband Karl's non-linear, cinematic style of event video editing, which is in turn inspired by techniques of the renowned Hollywood editor Walter Murch. Credit should be given to Barry Huggins, author of The Retouching Cookbook from O'Reilly Media, whose Watercolor segment suggested the basis for this refined procedure. Sara is an author of photographic books, a magazine contributor, and adjunct professor of digital imaging at Red Rocks Community College. Her specialty is never-duplicated digital composite albums filled with her personal brand of "pixel surgery" shown at her photographic atelier, Photo Mirage Imaging, in Denver, Colorado. Contact her at firstname.lastname@example.org.
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