vb.net barcode component DIGITAL PHOTOS in Java

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CHAPTER 20 DIGITAL PHOTOS
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Figure 20-5. Set the opacity of various layers by clicking and dragging the relevant slider in the Layers dialog box.
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The first step when editing most images is to correct the brightness, contrast, and color saturation. This helps overcome some of the deficiencies that are commonly found in digital photographs or scanned-in images. To do this, right-click the image and select Colors. You ll find a variety of options to let you tweak the image, allowing you a lot of control over the process. For simple brightness and contrast changes, selecting the Brightness-Contrast menu option will open a dialog box where clicking and dragging the sliders will alter the image. The changes you make will be previewed on the image itself, so you should be able to get things just right. Similarly, the Hue-Saturation option will let you alter the color balance and the strength of the colors (the saturation) by clicking and dragging sliders. By selecting the color bar options at the top of the window, you can choose individual colors to boost. Clicking the Master button will let you once again alter all colors at the same time.
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The trouble with clicking and dragging sliders is that it relies on human intuition. This can easily be clouded by a badly calibrated monitor, which might be set too dark or too light. Because of this, GIMP offers another handy option: Levels. To access the Levels feature, right-click the image and select Colors Levels. This presents a chart of the brightness levels in the photo and lets you set the dark, shadows, and highlight points, as shown in Figure 20-6. Three sliders beneath the chart represent, from left to right, the darkest point, the midtones (shadows), and the highlights within the picture. The first step is to set the dark and light sliders at the left and right of the edges of the chart. This will make sure that the range of brightness from the lightest point to the darkest point is set correctly. The next step is to adjust the middle slider so that it s roughly in the middle of the highest peak within the chart. This will accurately set the midtone point, ensuring an even spread of brightness across the image.
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Figure 20-6. The Levels function can be used to accurately set the brightness levels across
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an image.
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CHAPTER 20 DIGITAL PHOTOS
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A little artistic license is usually allowed at this stage, and depending on the effect you want in the photo, moving the midtone slider a little to the left and/or right of the highest peak might produce more acceptable results. However, be aware that the monitor might be showing incorrect brightness or color values.
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Cropping and Healing
After you ve adjusted the colors, you might want to use the Crop tool to remove any extraneous details outside the focus of the image. For example, in a portrait of someone taken from a distance away, you might choose to crop the photo to show only the person s head and shoulders, or you might separate a group of people from their surroundings, as shown in Figure 20-7.
Figure 20-7. You can use the Crop tool to remove any irrelevant details surrounding the subject of your photo.
You might also want to use the Healing tool to remove facial blemishes. Start by using the Zoom tool to close in on the area. If the blemish is small, you might need to zoom in quite substantially. Then try to find an area of skin that is clear and from which you can
C HA PTE R 20 DIGITA L PHOTOS
copy. Ctrl-click that area. Then click and draw over the blemish. The crosshair indicates the area from which you re copying.
Sharpening
One handy trick that can improve your photos is to use the Sharpen filter. This has the effect of adding definition to the image and reducing any slight blur caused by camera shake or poor focusing. To apply the Sharpen filter, right-click the image and select Filters Enhance Sharpen. As shown in Figure 20-8, a small preview window will show the effect of the sharpening on the image (you might need to use the scroll bars to move to an appropriate part of the image). Clicking and dragging the slider at the bottom of the dialog box will alter the severity of the sharpening effect. Too much sharpening can ruin a picture, so be careful. Try to use the effect subtly.
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