barcode dll for vb net 8: Manipulating Color in Software

Creation ANSI/AIM Code 128 in Software 8: Manipulating Color

CHAPTER 8: Manipulating Color
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need to handle that task manually. The filter package should tell you how much exposure adjustment is needed. (Look for the filter factor number; see 1 for an explanation of what this number means to exposure.) Remember that in autoexposure mode, you can raise the EV value to produce a brighter exposure.
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If you re comfortable with computers, you can adjust image colors after the
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fact using your photo editor s color-balancing tools. The lower left example on Page 27 of the color insert offers an illustration. For this image, I used the Photoshop Elements Color Variations filter, shown in Figure 8.1. To produce a warming effect, decrease blue and cyan, and increase red and yellow. I added a bit more yellow than red in my example image to produce a more golden tone than created by the 81B warming filter.
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FIGURE 8.1 You can produce color shifts similar to what you get with a traditional warming filter by using your photo editor s Color Variations or Color Balance filter.
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Some color-balancing tools, including the Photoshop Elements Variations filter, enable you to adjust shadows, midtones, and highlights independently. If you want to mimic the look of a real warming filter, keep all tones in the same ballpark.
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Note also that the Photoshop Elements Variations filter, as well as similar filters in some other programs, appears at first glance to provide controls for adjusting the amount of red, green, and blue only. But when you decrease red, green, or blue, you simultaneously add the color that s in the opposite position on the color wheel. In case you re not familiar with the color wheel: Red is opposite cyan; green is opposite magenta; and blue is opposite yellow. So if you want to add yellow, for example, you decrease blue.
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If you re really into digital color manipulation, check out color-effects packages such as those in the Color Efex Pro! line from nik multimedia. I used the Brilliance/Warmth filter, shown here, from the Complete Collection to produce the final image on Page 27 of the color insert, adding a golden glow to the ruins without also toning down the sky. Like most effects filters, the ones in the Color Efex Pro! family are Photoshopcompatible plug-ins; they work with any photo editor that accepts such plug-ins, not just Photoshop. Prices range from $70 to $300, depending on the version of the product you choose. For more information and free demos, visit www.nikmultimedia.com.
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Making Gray Skies Blue: Using a Polarizing Filter
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On days when skies are less than photogenic, you may be able to coax a little more blue out of the clouds by using a polarizing filter. In clear weather, the filter can make blue skies even more so.
4 provides a detailed description of how polarizing filters work.
As an example, see Page 28 of the color insert. The top image shows the sky as it really was on the day I took this picture mostly cloudy, with just the vaguest hint of blue. With the help of the polarizing filter, the lower left image shows a respectable amount of blue. It s not ideal, but it s certainly more pleasing than the first image, assuming that you re not going for that life-is-dismal, all-is-lost mood.
CHAPTER 8: Manipulating Color
A polarizing filter is not always effective, however. If skies are completely overcast, don t bother the filter will reduce the amount of light coming into your camera, but that s all. Even on a clear day, the impact of the filter will be negligible unless the sun, camera lens, and subject are in a particular alignment. For best results, your lens must be at a 90-degree angle to the sun. Unless the sun is directly overhead, that means that it is at either your left or right shoulder. But that s not the only complication. Even when you re positioned properly, the polarizer has maximum impact on a narrow arc of sky at a 90-degree angle to the sun. At noon, for example, the sky at the horizon line receives the filter s FIGURE 8.2 A polarizing filter makes the full-strength color boost; the effect fades out above maximum impact on the arc that line. Figure 8.2 may help you make sense of of sky that s at a 90-degree angle to the sun. this whole issue if you re not a math major.
To determine what band of sky will be most affected by a polarizing filter, make an L with your thumb and forefinger, pointing your thumb at the sun. Now rotate your wrist in and out. The arc that your finger travels will receive the maximum polarizing impact.
Bear in mind that a polarizing filter not only affects sky color, but also may eliminate reflections in glass and other shiny surfaces. As discussed in 4, this glare-reducing function also depends on the angle of camera, sun, and shiny surface. In my example image, shown in grayscale in Figure 8.3, notice the glass panes in the building (that s the Indiana State Museum, in downtown Indianapolis). When I first considered this view, the glass was reflecting surrounding buildings. I thought that would be a cool juxtaposition of structures, so I snapped the picture without the polarizer. Unfortunately, because of the camera angle, the reflections weren t quite strong enough to be clearly visible in the image. So I opted to use the polarizer for the next shot, which not only pulled more blue out of the sky but also eliminated most of the subtle reflections, giving the glass its more dramatic, almost black appearance. Notice, however, that reflections in the canal that runs in front of the building are only slightly diminished; the angles of the water, lens, and sun weren t right for the filter to make much impact there.
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