CHAPTER 2 IMPROVING DIGITAL PHOTOS Figure 2-12. (Web site development)
CHAPTER 2 IMPROVING DIGITAL PHOTOS Figure 2-12. The Brightness-Contrast dialog. The original image is too dark. The basic controls in the dialog are simple: two sliders, one for brightness and one for contrast. You can also type in numbers (the values go from 127 to 127, with 0 as the current image), but most of the time you ll probably just drag the sliders until the image looks the way you want it. In addition, the dialog has a checkbox marked Preview. With Preview on, any changes you make to the sliders will be shown in the image window, so you can see exactly how your changes will look. No actual changes will be made until you click OK. Many GIMP dialogs have a Preview option; it s a very useful feature that you ll want to enable unless you have a very slow machine. If you get the settings too far off, the Reset button at the bottom of the dialog will set them back to 0 so you can start over. Cancel will dismiss the dialog without making any changes to the image, while OK will take the current settings and change the image accordingly. Figures 2-13, 2-14, and 2-15 show some examples of the changes brightness and contrast can make. Play around with the sliders to get a feel for what they do. You ll probably find that when you make an image brighter, you ll want to increase contrast a bit, or else it will look washed out. You may also be surprised at how well a slight contrast increase can bring out brighter colors in an image. Be careful of pushing contrast too far, though, or you can make the image look grainy.
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