Sử dụng photoshop cs5 part 26

Sử dụng Quick Masks Với tài liệu của bạn trong chế độ Quick Mask, bạn có thể vẽ một mặt nạ vào các phần của hình ảnh của bạn cần được bảo vệ, và thay đổi hình dáng (thêm vào hoặc loại bỏ các khu vực từ) của mặt nạ với công cụ Brush hoặc Bút chì. Nếu bạn tạo một lựa chọn đầu tiên, các mặt nạ sẽ bao gồm chỉ các khu vực được chọn. | 166 Chapter 9 Using Quick Masks With your document in Quick Mask mode you can paint a mask onto the parts of your image that need protection and reshape add to or remove areas from the mask with the Brush or Pencil tool. If you create a selection first the mask will cover just the unselected areas. By default the mask is semitransparent red as in a traditional rubylith. The Quick Mask itself can t be saved but when you put your document back into Standard non-Quick Mask mode the mask will turn into a selection automatically at which point it can either be saved as an alpha channel or turned into a layer mask. To reshape a selection using a Quick Mask 1. Select an area of a layer. A 2. Click the Edit in Quick Mask Mode button IQI at the bottom of the Tools panel or press Q. A mask should cover the unselected areas of the image. If it doesn t double-click the same button click Color Indicates Masked Areas then click OK. 3. Choose the Brush tool B or Shift-B . 4. On the Options bar click the Brush Preset picker arrowhead then click a Hard Round brush choose Mode Normal and set the Opacity and Flow to 100 . 5. Zoom in on the mask area to be reshaped then do any of the following Apply strokes with black as the Foreground color to enlarge the masked protected area. Press X to swap the Foreground and Background colors make the Foreground color white then apply strokes in the document to enlarge the unmasked area. C To create a partial mask lower the brush opacity via the Options bar before applying strokes. When you edit pixels within the selection that area will be only partially affected by your edits. 6. To restore the normal document mode click the Edit in Standard Mode button IS on the Tools panel or press Q. The unmasked areas turn into a selection. 7. Optional To preserve the selection save it as an alpha channel see page 160 or as a layer mask see page 168 . A An area of a layer is selected. The unselected area is covered with a red Quick Mask. With our document .