TAILIEUCHUNG - Enhancing CAD Drawings with Photoshop phần 9

Bạn có thể mô phỏng hiệu ứng này trong Photoshop bằng cách sử dụng chế độ màu duotone. Trong Photoshop, chế độ màu duotone chung đại diện cho giọng đều đều, duotone, tritone, và in quadtone. Những thuật ngữ này đề cập đến việc thực hành in ấn màu xám với một đến bốn màu mực. | reproducing grayscale images with colored inks 289 Reproducing Grayscale Images with Colored Inks Anyone who has studied traditional photography is probably aware of the beauty of old-fashioned photographs. For example sepia-toned prints have a pleasing antique feel and warmth that is uncommon in computer graphics. You can simulate this effect in Photoshop using Duotone color mode. In Photoshop Duotone color mode collectively represents monotone duotone tritone and quadtone prints. These terms refer to the practice of printing grayscale images with one- to four-colored inks. Photoshop does not maintain separate channels for these inks like it does in RGB and CMYK modes. Instead the tonal information in duotones come from a single channel containing 256 value levels only similar to grayscale . Each ink is allocated a portion of the tonal range in the Duotone Options dialog box using curves. Let s take a look at how this works. 1. If you have open from the previous exercise you can continue here if not open that file from your hard drive before continuing. This file is also provided on the companion CD if you are jumping in here. 2. Click the Layers palette if it is not already active. Click the triangle button and select Flatten Image from the palette menu. Click OK in the warning dialog box to discard hidden layers. WARNING You cannot convert directly from RGB to Duotone color mode without first converting to grayscale in order to discard the additional color channels. 3. Choose Image Mode Grayscale. Click OK to the warning dialog box asking whether you want to discard color information. The black-and-white image was stored with RGB channels previously and now it has only one Gray channel carrying the tonal information. 4. Click the Channels palette. Notice that in addition to the Gray channel special channels still appear from the previous exercise. Delete the Alpha 1 ObjectID Normal and Zdepth channels by dragging and dropping them on the Trash .

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