§ 6. Similarly, you may customize color in the Color panel (Window > Color). By default, it uses RGB color model. This means you adjust colors by moving Red (R), Green (G), and/or Blue (B) sliders.

§ 7. Alternatively, you may choose CMYK (Cyan-Magenta-Yellow-Black), or any other color model available in the panel menu. For example, HSB model allows us to tune hue (H), saturation (S), and/or brightness (B) of the color.

§ 8. You must have noticed the backward color box. Click this swatch on the Toolbox and choose a color in the Color Picker - you have changed "background" or "canvas" color. To see what this means clear a fragment of your image with the Eraser tool. Also, you can show this color by making canvas larger than the image itself (see page 69).

§ 9. Click the backward box in the Color palette. Now its sliders remix the background color. Moreover, in this mode by clicking on your image with the Eyedropper or picking a sample in the Swatches palette, you also select the background color so, once finished, do not forget to reselect the foreground color square for future work.

§ 10. In the Toolbox, click the arrow between foreground and background swatches or press on your keyboard [X] key to swap the colors. This simple method lets you, for example, paint with two predefined colors by turns.

§ 11. Need to paint with several custom colors? Just save those to your Swatches set.