from 0 to 255. The exact meaning of this value depends on the type of channel, e.g. in the RGB color model the value in the R-channel means the amount of red which is added to the colour of the different pixels Components of the RGB and CMY Color Model (a) In the RGB Color Model, mixing Red, Green and Blue gives White. That’s what happens on your screen. (b) In the CMY(K) color model, mixing Cyan, Magenta and Yellow image seen through a colored glass. You can use it to give a ‘ Sepia’ effect to your image. See Color model for Hue, Saturation, Luminosity. 12.5.3.1 Activate Tool You can get to the Hue-Saturation tool in

Components of the RGB and CMY Color Model (a) In the RGB Color Model, mixing Red, Green and Blue gives White, which is what hap- pens on your screen. (b) In the CMY(K) color model, mixing Cyan, Magenta and Yellow you the possibility to manage colors from the CMYK color model. Triangle Figure 15.27 The triangle selector This selector uses the HSV color model. Click in the chromatic circle and drag the mouse pointer endpoint’s color (set the left and right edge colors for each segment), blend colors, select a color model and edit segments. This editor works only with custom gradients or a copy of a system gradient. 384

the active layer or selection into a greyscale image seen through a colored glass. See HSV Color Model for Hue, Saturation, Luminosity. Activate Tool The Colorize Tool can be called in the following y d o c b o o k 2 o d f The Mode submenu contains commands which let you change the color model of the image. There are three modes. Activating the Submenu • You can access this submenu from their complementary colors. For more information about colors, see the Glossary entry about Color Model. This command only works on layers of RGB and Grayscale images. If the current image is Indexed

Grayscale And Indexed” on page 266). The rule of thumb is: Always work with RGB (or with whatever color model you need) and don’t convert it until you’re finished. GUASH One of Gimp’s most useful features is FG to BG (HSV) option (HSV stands for Hue, Saturation and Value). HSV Gradients HSV is a color model based on a 360-degree spectrum circle. This means that a gradient using an HSV blend will not simply faster on the right side. Coloring The coloring type for segment submenu lets you choose a color model for your selection or segment. You can choose Plain RGB and two kinds of HSV. See “Color Models” starting