Ebook On Drawing Pencil Portraits
The Find Edges filter is possibly the most commonly used filter used to create line drawings, but the filter results in lines made with shades of gray. The reason for this is that Find Edges makes low-contrast areas white, medium-contrast areas gray, and high-contrast areas become black. It also turns hard edges into thin lines and soft edges into fat lines. The result is a line drawing that is very different from the thin lines that we get by using the Smart Blur filter. It can, however, transform some digital photos into some pretty cool line drawings.
The High Pass filter is especially useful as a precursor to Image Adjust Threshold, which converts all pixels in an image to black and white (again, covered in Chapter 17). As illustrated in Figure 10-18, the Threshold command produces entirely different effects on images before and after you alter them with the High Pass filter. In fact, applying the High Pass filter with a low Radius value and then issuing the Threshold command converts your image into a line drawing.
AutoCAD elevations are line drawings that often include line thickness (called line weight in AutoCAD) as another graphical dimension. Traditionally, elevations convey the outlines of a structure's major features, and line weight emphasizes depth and the relative importance of the objects shown. Elevation line drawing in AutoCAD Elevation line drawing in AutoCAD
Here's an effect that started off with a blurred, inverted Color Dodge layer. Usually, this is a good base for a line drawing the degree of blur controls the lines' strength. But instead of using blur, I wanted to see the effect of applying the Unsharp Mask filter over a wide area that is, pushing up its radius slider. It took no time to repeat the process with Ctrl Cmd-F and discover that evenly toned areas could be bleached and the details could be fringed with the original image colors. It's such an easy recipe and can be applied to all sorts of pictures.
Blending the base layer with an exact but inverted copy of itself results in an all-white image However, apply a little Gaussian blur to the picture and things become a little more interesting Because blacks are preserved, using a small Gaussian blur radius with an inverted copy of the image will result in a line-drawing effect Color Dodge therefore allows you to build your own Find Edges filter that to some extent you can fine-tune afterward by increasing the blur Once it's applied, you can control its strength by reducing the layer's opacity However, you can't reverse the blur itself unless you step back through the History or use the History brush So, add Gaussian blur a little at a time and build up the line-drawing effect until you've created the desired result Applying Color Dodge plus a little blur to an inverted image produces a line drawing.
The Colored Pencil filter adds a light, airy feel. The Colored Pencil filter adds a light, airy feel. 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.
Chapter 5 looks at how to enhance AutoCAD plan drawings with the power of Photoshop. You'll add tone, color, pattern, gradient, transparency, and shadow to line drawings that pop the presentation up to a new level. Chapter 6 examines the traditional elevation line drawing and dresses it up with Photoshop's layer style effects, shadows, reflection and refraction, and entourage. Your clients will understand your colorized elevations much more readily after you master the techniques presented in this chapter. Chapter 8 opens the door to non-photo-realistic illustrations that you can make in Photoshop based on a 3D model from Autodesk VIZ. Illustrations stimulate the imagination and can have a range of appearances from pencil sketches to watercolors and painted looks.
Perhaps the most important transformation made to a line drawing in Photoshop is simulating texture, because it gives the image realistic-looking surfaces. Let's start by filling areas with flat color and then texturize them by filtering with visual noise. In addition, you can add scans or photos of real materials to your pattern library and then apply them to the elevation. Later in this section you will learn how to cut reveals (gaps) into the stonework, patterning a surface with proportional lines.
When you drag the pen tool, Photoshop draws direction lines and direction points from the anchor point. You can use these direction lines and points to adjust the shape and direction of the curve. You'll edit paths using the direction lines and direction points after you practice drawing curved paths.
Creating striking illustrations in Photoshop is easy when you use photography as your starting point. You don't really need any traditional drawing skills, you simply need to understand which tools are right for the task at hand, and how to use them to your advantage. All of the details and divisions of color necessary to create a stunning illustration exist in your photography, you just need to recognize the potential within the image and make use of it.
You can produce interesting results by inverting the blend layer and applying small amounts of Gaussian blur At first, the image is completely white, but as you increase the Gaussian radius, you will see a line drawing begin to emerge In this picture of the girl, a little blur washes out the image, around 10-15 produces a weak line drawing, while pushing the radius up to around 25 produces the most balanced effect Applying Linear Dodge and Gaussian blur with a radius of 25 to an inverted image produces a balanced combination between a line drawing and a bleached photograph. A smaller amount of blur (here, I've used a value of 10) produces a weak line drawing without the need for filters.
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