Ftp web hosting - CHAPTER 20 IMAGE EDITING Generic: In this
CHAPTER 20 IMAGE EDITING Generic: In this category, you can find a handful of filters that don t seem to fall into any other category. Of particular interest is the Convolution Matrix option, which lets you create your own filters by inputting numeric values. According to The GIMP s programmers, this is designed primarily for mathematicians, but it can also be used by others to create random special effects. Simply input values and then preview the effect. Glass Effects: As the name suggests, these filters can apply effects to the image to imitate the effects that come about when glass is used to produce an image. For example, the Apply Lens filter will apply the same kind of distortion caused by various wide-angle lenses used on cameras, as shown in Figure 20-8. Figure 20-8. The Glass Effects . Apply Lens filter can be used to imitate a fish-eye lens. Light Effects: Here, you will find filters that imitate the effects that light can have on a picture, such as adding sparkle effects to highlights or imitating lens flare caused by a camera s lens. Distorts: As the name of this category of filters suggests, the effects here distort the image in various ways. For example, Whirl and Pinch allow you to tug and push the image to distort it (to understand what is meant here, imagine the image is printed on rubber and then pinching or pushing the surface). This category also contains other special effects, such as Pagecurl, which imitates the curl of a page at the bottom of the picture.