TAILIEUCHUNG - Understanding Adobe Photoshop CS4- P2

Understanding Adobe Photoshop CS4- P2: Learning Adobe Photoshop is essential to success in digital media industries. Photoshop is a gateway into several related technologies. From digital image acquisition and processing to typography and compositing, Photoshop is often your fi rst introduction. If you can master this program, you can go on to success with several other technologies. With this in mind, it is important to learn Photoshop with one eye on the present and the other on the future. | 18 Chapter 2 Photoshop s Interface Adjustments One of the most common tasks in Photoshop is making adjustments to images to fix tone and color. Photoshop CS4 adds a new Adjustments panel to provide easy access to the most common commands. The adjustments are grouped into three categories Tonal controls. Use these controls to adjust Brightness Con-trast Levels Curves and Exposure in a nondestructive fashion. Color controls. Use these controls to adjust Hue Saturation Color Balance Black White conversion Photo Filter and Channel Mixer properties. Creative Advanced controls. These controls are special purpose adjustments and include Invert Posterize Threshold Gradient Map and Selective Color. You ll also find a useful list of presets for quick access to common adjustments as well as custom settings you create. You ll explore these adjustments more in later chapters. Masks Photoshop uses masks to obscure parts of an associated item. In fact you can apply a mask to a layer a vector or a filter. Photoshop CS4 offers precise control over masks including the ability to adjust their density and edges. Masks are a useful way to erase parts of a layer non-destructively which allows for future changes. They can also be used to isolate an adjustment to only parts of an image. You ll see multiple masks in use in the sample document to isolate the effects of color correction. You ll explore masks in depth in Chapter 7 Layer Masking. Color Don t confuse the Color panel with the color mode of the document. The Color panel allows you to modify and select colors using six different color models. You can choose colors using RGB sliders or the more intuitive Hue Saturation and Brightness HSB model. To adjust color move Understanding the Interface 19 the sliders for the corresponding value. Sliding the Red slider to the right increases the amount of red in the new color. Choosing colors is independent of image mode in that you can use a CMYK model for an RGB image. However picking a .

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