Tham khảo tài liệu 'professional information technology-programming book part 25', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . Adjustment Layer Advantages You probably already understand this but an adjustment layer actually doesn t make any changes to the layers below it. It simply gives Photoshop CS2 instructions on how the image should look and print. Adjustment layers have the further advantage of being readjustable at any time as long as you haven t merged or flattened their layers which you should only do when you duplicate the image and flatten it to purposely send an unmodifiable version to someone outside your company or personal domain . If you re not yet familiar with adjustment layers you ll find them listed on a menu that appears after clicking the New Adjustment Layer icon at the bottom of the Layers palette or by choosing Layer New Adjustment Layer. The adjustment commands that are available on adjustment layers use exactly the same dialog as their Image Adjustments menu counterparts. So if you know how to adjust without an adjustment layer you also know how to adjust with 6-1 shows the specific adjustments that are available as adjustment layers. Table 6-1. Table 6-1. Available adjustment layer options Levels Hue Saturation Photo Filter Curves Selective Color Invert Color Balance Channel Mixer Threshold Brightness Contrast Gradient Map Posterize The adjustments in Table 6-2 are available only as destructive adjustments which I ll show you how to apply in a nondestructive way in Chapter 11. Table 6-2. Table 6-2. Available destructive adjustments Auto Levels Auto Contrast Auto Color Match Color Replace Color Shadow Highlight Equalize Threshold Variations Auto Levels Table 6-2. Table 6-2. Available destructive adjustments Match Color Equalize Desaturate Exposure NOTE All of the routines in this section assume that you have run the basic Workflow Layers Action described in the The Magic Action for Layered Workflow section in Chapter 5. If you skipped that chapter jump back before going on. What follows is an example of how each adjustment layer type might be .
