Simulating Different Media


One of the remarkable tricks Photoshop can do is simulate the appearance of other media. The effect can be achieved through the use of a filter (I jump ahead a little in this hour and introduce you to some of Photoshop's "artistic" filters). It can also be achieved through the use of the Smudge and Blur tools, or by choosing custom brushes and carefully applying paint with a particular blending mode. You can create a picture from scratch, or you can start with a photograph and make it look like a watercolor, an oil painting in any of a half- dozen styles, or even a plaster bas relief. Whatever the method, the results will amaze you.

Watercolors

Artists who work in conventional media have a great deal of respect for those who choose watercolors. It's probably the most difficult medium of all to handle. You have to work "wet" to blend colors, but not so wet that the image turns to mud. Doing it digitally is much easier. We'll start with a filter technique that makes a photo appear to have been created as a watercolor painting.

Converting a Photograph to a Watercolor

Photoshop has a watercolor filter that converts a picture to a watercolor version of itself. You can find the filter in the Filter Artistic submenu, as shown in Figure 10.1.

Figure 10.1. Watercolor is one of 15 artistic filters.


Filters , in Photoshop terminology, are sets of instructions built into the program (or "plugged-in" as added features) that apply specific effects to your pictures. For instance, one of Photoshop's filters converts your image to a pattern of dots. Another simulates a colored pencil. Dozens of filters are available. Some come with the program, whereas others are sold by third-party vendors or distributed as shareware or freeware. In Hours 14-16, you'll learn more about what kinds of filters you can get and where.

The Watercolor filter works most effectively on pictures that have large, bold areas and not a lot of detail. Because it also tends to darken backgrounds and shadows, it's best to start with a picture that has a light background. The photo in the figures that follow features some very white flowers. When you select the Watercolor filter (or virtually any other Photoshop filter, for that matter), you open a dialog box like the one shown in Figure 10.2. This Filter Gallery has a thumbnail view of your picture and a set of sliders that enable you to set the way in which the picture is converted. As of Photoshop CS, many of the filter dialog boxes also show you the list of available filters and a thumbnail- sized sample of the effects they produce. If you click and drag on the thumbnail image, you can slide it around to see the effect of your settings on different parts of the photo. Most Photoshop filters have dialog boxes and settings very much like this one. After you have tried even one, the rest will be just as easy.

Figure 10.2. Use the + and buttons to zoom in and out on the thumbnail.

Filters can take anywhere from a few seconds to a minute or more to apply. If you don't see the effects of the filter on the thumbnail view immediately, look for a progress bar in the status bar at the bottom of the filter window. It grows as the computer calculates and applies the Filter effect. When the bar is filled, the effect is in place.

Brush detail varies from 1 to 14, with 14 giving you the most detail, and 1 being a sort of Jackson Pollock splatter effect. Depending on the nature of the picture you are converting and your own preferences, you might want to start experimenting with settings around 9 to 12. Shadow intensity can be adjusted from 0 to 10, but, unless you are looking for special effects, leave it at 0. The Watercolor filter darkens shadows too much, even at the 0 setting. By the time you move it past 3 to 4, the picture is almost totally black. Texture settings vary from 1 to 3. These are actually quite subtle, and you might wonder whether they have any effect at all. They do, but the effects are more noticeable combined with less detailed brush settings. In Figure 10.3 (in the following Try it Yourself), I've gathered samples of different brush detail and texture settings so that you can see the differences.

Figure 10.3. All three texture settings have been applied to each sample brush setting.


Try it Yourself

Converting a Photograph to a Watercolor

You might not want to convert all your photos into imitation watercolors, but some look really good with this treatment.

1.
Find a picture that you think might look good as a watercolor, or download the one shown in the "Try it Yourself" section from our website. It's called rhodies.jpg . To get to the website, point your web browser to www.samspublishing.com, and type the book's name or ISBN.

After the main book page has loaded, click the Downloads link to get to the files. Open the downloaded file in Photoshop and make any color adjustments you think necessary. I think it could be lighter, so that's what I did. (If you've forgotten how, turn back to Hour 6, "Adjusting Color," to refresh your memory.) Remember not to let the colors get too dark before you start applying filters. Photoshop filters, in general, tend to add more black to the image.

2.
Choose Watercolor from the Filter Artistic submenu.

3.
In the Watercolor filter window, shown in Figure 10.4, use the sliders to choose a combination of texture and brush detail that you like.

Figure 10.4. I've set the Brush Detail to 1 and Texture to 2. You can see this version in the color section.


Set the shadow intensity to 0, unless you want a lot of black in the image.

4.
Move the thumbnail image to check details by clicking and dragging the hand symbol that appears when you place your cursor in the thumbnail window.

5.
Click OK when you're done to apply the changes.

6.
If the picture seems drab, use the Sponge tool set to Saturate to bring out the colors.


Watercolors from Scratch

Sometimes you either don't have a photo of what you want to paint, or you just want to do it yourself. Perhaps you want a different style of watercolor than what's possible with the filter. If you work patiently and with some forethought, you can produce watercolors that you'd almost swear were painted with a brush on paper. Let's open a new document in Photoshop and do some painting.

You learned about working with the Brush tool in Hour 7, "Paintbrushes and Art Tools." As you recall, using the Tool Options bar, you can switch from a large brush to a small one, or change the opacity, with just a click. I also like to open the Swatches palette and use it as a paintbox to select colors, rather than going to the Color Picker each time. Please feel free to flip back if you need to refresh your memory about any of these issues.

Sort Your Palettes

If you drag on the tabs at the top of the palettes, you can move them around so you can use the Layers, History, Color, and Swatches palettes all at once, or whatever combination of palettes you need. Close the ones you aren't using to make more room. Dock the palettes you're most likely to needfor instance, Brushes, Layers, Color, and Historyin the docking well at the right end of the Tool Options bar.



Transparency is one of the distinguishing features of real watercolor. To make a "synthetic" watercolor, you'll want to set the Brush opacity at no more than 75%. Because transparent is the opposite of opaque , this means that your paint will be 25% transparent, which is about right for watercolors. Try the brush on a blank page, and you'll notice that, as you paint over a previous stroke, the color darkens. Click the Wet Edges check box in the Brushes palette for even more authentic brush strokes. This option adds extra color along the edges of a stroke, making it look as if the pigment gathered there, as it does when you paint with a very watery brush.

Watercolor artists painting on paper often start with an outline and then fill in the details. Figure 10.5 shows the beginnings of a watercolor painting of an apple. I've drawn the fruit and its stem and leaves, and now I'm working on filling in the leaves with a small brush. It's often easier to work in a magnified view when you're doing small details like this.

Figure 10.5. Use the brushes with soft edges.


Another useful trick for creating a watercolor is to use the Eraser as if it were a brush full of plain water to lighten a color that you have applied too darkly. Use it at a very low opacity to lighten a color slightly, and at a high opacity to clean up around the edges if your paintbrush got away from you. Don't forget that the Eraser always erases to the background color. If you have been changing colors as you paint, make sure to set the background color to what you want to see when you erase, or keep your painting on a separate layer from the textured background layer.

Take One Tablet

For this kind of task, a pressure-sensitive graphics tablet, although not an absolute must, is certainly helpful. Drawing with a stylus is far more natural than drawing with a mouse or trackball , and the pressure-sensitive function permits you to make brush strokes that trail off like the real ones, rather than having to rely on the less versatile Fade Steps option to create the effect.



Most real watercolors are painted on heavily textured watercolor paper. If you would like yours to have the same grainy character, you can use the Texturizer (Filter Texture Texturizer) filter to add the watercolor paper texture to the picture after your painting is completed. Dont apply it until everything else is done, though, because additional changes you make will alter the texture. Figure 10.6 shows the Texturizer filter being applied.

Figure 10.6. The direction of the light affects the shadows that make up the texture.

The Canvas texture comes the closest to replicating watercolor paper, especially if you scale it down some. Sandstone works well, too. I like to set it at 70%, with a relief height of 3. Use the sliders to set relief and scaling. I find that applying the same texture a second time with the light coming from the opposite direction gives me the best imitation of textured paper. Of course, you can also print your images on real watercolor paper. Lighter weight papers run through an inkjet printer very nicely .

Oil Painting

Oil paint has a very different look from watercolor, and it's a look that Photoshop duplicates particularly well. The qualities that distinguish works in oil are the opacity of the paint, the textured canvas that adds a definite fabric grain to the image, and the thick, sometimes three-dimensional quality of the paint. To get the full effect in Photoshop, you might have to combine several techniques. We'll start, as artists do, with underpainting.

Underpainting

When an artist starts an oil painting of a landscape or a seascape, she usually sketches out the subject with a few lines, often working with charcoal or a pencil to locate the horizon and major land masses. Then she dips a big brush in thinned-out paint and begins the process of underpainting. This blocks in all the solid areas; the sky, the ground, the ocean, and any obvious features like a large rock, a cliff, or whatever else might be included. Underpainting builds the foundation of the picture, establishing the colors and values of the different parts of the image. After that, all that's left is to fill in the details.

Photoshop's Underpainting filter looks at the image that you're applying it to and reduces it to the same sort of solid blobs of color. In Figure 10.7, I'm applying the filter to a photo of a pond. If you want to download this photo and work along, it's called fallpond and it's at the Sams website discussed earlier in this hour.

Figure 10.7. Check your settings in the Preview area before you apply them.

Underpainting gives you the basic elements of the picture, minus the details. Using the Underpainting filter requires making some settings decisions. The Texture settings are exactly the same as in the Texturizer filter used on the watercolor. Here, though, you want to bring out more of the texture, so you use a higher relief number, and possibly a larger scale on the canvas. You can also paint on burlap , sandstone, or brick, or on textures that you import from elsewhere. The Brush Size setting ranges from 0 to 40. Smaller brushes retain more of the texture and detail of the original image. Larger brushes give a somewhat spotty coverage and remove all the detail. Texture Coverage also ranges on a scale from 0 to 40. Lower numbers here reveal less of the texture; higher numbers bring out more of it. In underpainting, the texture is revealed only where there's paint, not all over the canvas.

Try it Yourself

Turn a Scene into an Oil Painting

The character of an oil painting is quite different from that of a watercolor. Let's try to apply the oil paint technique to a photo.

1.
As always, start by preparing the picture. Adjust the colors if necessary and crop as needed.

2.
Open the Underpainting filter dialog box (Filter Artistic Underpainting).

3.
Set the Brush Size to 6 and the Texture Coverage to 21. These settings will retain most of the detail in the picture.

4.
Set the Texture to Canvas and Scaling to somewhere around 70%. You want to keep the texture small so that it doesn't interfere with the detail you will be adding to the picture later.

5.
Set the Relief to 7 and the Light Direction to Top Right. This shows just enough texture to establish that your painting is on canvas rather than stone. The Light Direction matches the position of the sun.

6.
Click OK to apply the filter. Figure 10.8 shows the result so far.

Figure 10.8. The scene with just the Underpainting applied.



Overpainting

The Underpainting filter leaves you with a somewhat indistinct picture, fine for some purposes but definitely unfinished . An artist would proceed to go back and overpaint the areas that need to have detail, so that's what you'll do to complete this autumn scene.

Because oil paintbrushes tend to be rather stiff, choose a hard brush rather than a soft-edged one. Be sure to turn off Wet Edges in the Brushes palette, if it happens to be on. You'll probably also want to change the blending mode, although Normal will work fine for some parts of the painting where you want to make actual strokes of paint. However, Dissolve might be the most useful mode for working into the trees. Use it, as shown in Figure 10.9, to stipple colors into the underpainting. ( Stippling means to paint with the very end of a hard round brush, placing dots rather than strokes of paint. Dissolve does this effect very well.) Vary the Brush Size and Opacity to add more or less paint with each stroke.

Figure 10.9. I've added orange and brighter greens to the trees, and sharpened up the close evergreens.


You can go on painting into this picture until it looks exactly like an oil painting, or you can use it as a basis to experiment with other filters and effects. In Figure 10.10, I've applied the Texturizer filter (Filter Texture Texturizer) and used it to restore the texture lost from the overpainting process. See it completed in the color section.

Figure 10.10. Placing a canvas texture under this image makes it much more like an oil painting.


Pencil and Colored Pencil

The Pencil tool has been part of every graphics program since the very first ones. It's an extremely useful tool when you know how to use it properly. The Pencil tool shares a space in the toolbox with the Brush tool. You can use it (or any of the brushes) in a sort of connect-the-dots mode. Click where you want a line to begin, and Shift+click again where it should end. Photoshop draws the line for you. Keep Shift+clicking to add more line segments. The Pencil can also serve as an eraser if you click the Auto-Erase function on the Tool Options bar. With Auto-Erase enabled, when you click the Pencil point on a colored pixel that is the same color as the current foreground color, you erase it to the background color. Use this feature to clean up edges or to erase in a straight line.

Pencils are great for retouching and drawing a single pixel-width line, but difficult to use for an actual drawing. (Yes, you can set the Pencil to any of the brush shapes , but if you do that, it's functionally a brush.) The Pencil is easier to use if you zoom in to 200% so that you can see individual pixels. Setting the mouse acceleration to Slow will also help, but it's even better to use a graphics tablet instead of a mouse.

If you want to get the look of a pencil drawing without all the effort, try the Colored Pencil filter (Filter Artistic Colored Pencil) or the Crosshatch filter (Filter Brush Strokes Crosshatch). The Colored Pencil filter, shown in Figure 10.11, gives you a light, somewhat more stylized drawing from your original image. It looks even better if you convert the drawing to grayscale after applying the filter. The Crosshatch filter, applied to the same image in Figure 10.12, retains much more of the color and detail, but still looks like a pen-and-ink drawing.

Figure 10.11. The Colored Pencil filter adds a light, airy feel.


Figure 10.12. Crosshatching uses a different, more detailed drawing style.


Chalk and Charcoal

Chalk and charcoal drawings are found in museums and collections all over the world. Artists love these materials for their ease of use and versatile lines. You can make sharp lines or smudged ones just depending on how you hold the chalk or charcoal twig.

Chalk drawings can be found on virtually any surface, from grained paper, to brick walls, to sidewalks. Chalk drawings in Photoshop enable you to take advantage of the capabilities of the Texture filters. You can place your drawing on sandstone, burlap, or on a texture that you've imported from another source.

Chalk and charcoal are linear materials, which is to say that they draw lines rather than large flat areas like paints . Choose your subjects with that in mind. You can, of course, apply shading as a pattern of lines or a crosshatch, and you can smudge to your heart's content. If you're drawing from scratch, start with a fairly simple line drawing and expand on it. If you're translating a photo or scanned image into a chalk or charcoal drawing, choose one that has strong line patterns and well-defined detail.

The Chalk & Charcoal Filter

When you apply the Chalk & Charcoal filter, which is found on the Filter menu (Filter Sketch Chalk & Charcoal), youll see that it reduces your picture to three colors, using a dark gray plus the foreground and background colors that you have set in the tool window. Chalk uses the background color and Charcoal becomes the foreground color. Areas that aren't colored appear in gray. You will probably want to do some experimenting to find the right colors.

Figure 10.13 shows the Chalk & Charcoal dialog box, which controls how this filter works. In it you can set amounts for the chalk and charcoal areas. These sliders have a range from 0 to 20. Start somewhere in the middle and adjust until you get a combination that works for your picture. The Stroke Pressure varies from 0 to 5. Unless you want the picture to turn into areas of flat color, keep the setting at 1 or 2. Intensity builds up rather fast with this filter.

Figure 10.13. Move around in the preview window to see the filter's effects on different parts of the image.

Try it Yourself

Convert a Photograph to a Chalk and Charcoal Drawing

The Chalk & Charcoal filter looks great with any reasonably high-contrast subject. Try it on a portrait.

1.
Open the image and then the Chalk & Charcoal filter dialog box (Filter Sketch Chalk & Charcoal).

2.
Set the Charcoal and Chalk areas to 10 or less. When you work with a filter for the first time, always start in the middle of the settings range and increase or decrease as necessary.

3.
Set the pressure to 1 or 2. Move on to step 4 if you like the view in the Preview window, or experiment with other numbers.

4.
Click OK to apply the filter. Figure 10.14 shows this filter applied to the same portrait as in the previous example.

Figure 10.14. After applying the filter, I adjusted the overall contrast of the photo.


5.
Study the result. Decide what areas need touching up.

6.
Select the Eraser tool and erase to bring up more of the background color.

7.
Select the Brush tool to apply more of the foreground color.

8.
Use the Eyedropper to select the gray tone, if you need to apply more of it. (The gray is an arbitrary color used by this filter and can't be adjusted.)

9.
When you're satisfied with the drawing, save it.


The Smudge tool works nicely with chalk and charcoal. Use it exactly as you would use your finger or hand on paper to soften a line or blend two colors. Photoshop's Blur and Sharpen tools can also be used to define edges or to often a line without smudging it.

Lots to Learn

Photoshop CS2 includes over 100 filters! If you master one each week, within two years you'll know them all.



The Charcoal Filter

Use the Charcoal filter (Filter Sketch Charcoal) to convert an image to a good imitation of a charcoal drawing. Because charcoal doesnt come in colors, your charcoal drawings will be most successful if you set the foreground to black and the background to white, or to a pale color if you want the effect of drawing on colored paper. The Charcoal filter dialog box is shown in Figure 10.15. You can adjust the thickness of the line from 1 to 7 and the degree of detail from 0 to 5. The Light/Dark Balance setting ranges from 0 to 100 and controls the proportion of foreground to background color.

Figure 10.15. Experiment with these settings. Every image is different.

Figure 10.16 shows before and after versions of a portrait converted into charcoal and lightly retouched with the Brush, Blur, and Sharpen tools. Using a graphics tablet instead of a mouse makes it easier to reproduce the filter's crosshatched lines.

Figure 10.16. Retouching brought back the details that were lost in translation.




Teach Yourself Adobe Photoshop CS 2 In 24 Hours
Sams Teach Yourself Adobe Photoshop CS2 in 24 Hours
ISBN: 0672327554
EAN: 2147483647
Year: 2005
Pages: 241
Authors: Carla Rose

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