60-pixel hình dạng bàn chải mềm, và kéo ra ngoài từ các điểm khác nhau dọc theo chu vi của hộp sọ. Như thể hiện trong hình 9-6, kết hợp airbrush và mặt nạ là hữu ích trong Photoshop vì nó là trong thế giới thực. Kéo với công cụ smudge bôi màu sắc từ các điểm ảnh bên ngoài mặt nạ lựa chọn mà không thay đổi sự xuất hiện của những điểm ảnh. | Chapter 9 Masks and Extractions 389 60-pixel soft brush shape and dragged outward from various points along the perimeter of the skull. As demonstrated in Figure 9-6 combining airbrush and mask is as useful in Photoshop as it is in the real world. Figure 9-5 Dragging with the smudge tool smeared colors from pixels outside the selection mask without changing the appearance of those pixels. Figure 9-6 I dragged around the skull with the airbrush to distinguish it further from its background. Pretty cool effect huh Well if this is not your cup of tea maybe you can track down a teenager who will appreciate it. 390 Part III Selections Masks and Filters Working in Quick Mask Mode Selection masks give you an idea of what masks are all about but they only scrape the surface. The rest of this chapter revolves around using masks to define complex selection outlines. The most straightforward environment for creating a mask is the quick mask mode. In the quick mask mode a selection is expressed as a rubylith overlay. All deselected areas appear coated with red and selected areas appear without red coating as shown in the top examples of Color Plate 9-1. You can then edit the mask as desired and exit quick mask mode to return to the standard selection outline. The quick mask mode is as its name implies expeditious and convenient with none of the trappings or permanence of more conventional masks. It s kind of like a fast food restaurant you use it when you aren t overly concerned about quality and you want to get in and out in a hurry. How the quick mask mode works Typically you ll at least want to rough out a selection with the standard selection tools before entering the quick mask mode. Then you can concentrate on refining and modifying your selection inside the quick mask rather than having to create the selection from scratch. Naturally this is only a rule of thumb. I violate the rule several times throughout this chapter but only because the quick mask mode and I are such
