main purpose for using GIMP. However, you may create shapes by either painting them using the technique described in or by using the selection tools. Of course, there are various other ways to paint Sometimes it is hard to tell whether you have adjusted colors adequately. A good, objective technique is to find a point in the image that you know should be either white or a shade of gray. Activate should all be equal; if not, then you should see what sort of adjustment you need to make. This technique, when well used, allows even color-blind people to color-correct an image. If your image is washed

LZW : The image will be compressed using the ‘Lempel-Ziv-Welch’ algorithm, a lossless compression technique. This is an old method, still efficient and fast. More informations at [WKPD-LZW]. • Pack Bits the main purpose for using GIMP. However, you may create shapes by either painting them using the technique described in Figure 7.23 or by using the selection tools. Of course, there are various other ways resulting image is usually lighter, but some colors may be inverted. In photography, dodging is a technique used in a darkroom to increase the exposure in particular areas of the image. This brings out details

• LZW: The image is compressed using the “Lempel-Ziv-Welch” algorithm, a lossless compres- sion technique. This is efficient and fast. More information at [WKPD-LZW]. • Pack Bits: is a fast, simple compression designed to be used for drawing.3 However, you may create shapes by either painting them using the technique described in Section 7.14.1 or by using the selection tools. Of course, there are various other resulting image is usually lighter, but some colors may be inverted. In photography, dodging is a technique used in a darkroom to decrease the exposure in particular areas of the image. This brings out details

315) and then move the layer (by grabbing the layer by the dot), but this isn’t a very convenient technique. The solution to this problem is to press the Shift key as you drag. When you see the yellow layer adjust the position of a selection area, press the Alt key as you move the selection. With this technique, only the empty form of the selection moves, and not the contents. Note that this option only works it every time you move it. Note that the Move tool or a selec- tion tool must be active for this technique to work. Hints The Move tool has an extra feature that allows you to nudge (move in small, pre-