tailieunhanh - Photoshop cs5 by steve Johnson part 71

Tối ưu hóa một tài liệu JPEG Photoshop hoàn chỉnh với tất cả mọi thứ bạn sẽ cần phải đúng cách nén bất cứ tài liệu JPEG. Internet nói chung có thể được làm chậm để điều hướng, và truy cập của bạn thường không có nhiều kiên nhẫn. Khi bạn nén một hình ảnh JPEG, bạn sẽ cơ bản xóa bỏ thông tin từ các hình ảnh để giảm kích thước tập tin của mình và tăng tốc thời gian tải. | Optimizing a JPEG Document Photoshop comes complete with everything you will need to properly compress any JPEG Document. The Internet can generally be slow to navigate and your visitors typically do not have much patience. When you compress a JPEG image you re essentially removing information from the image to reduce its file size and speed up the loading time. The unfortunate result of that reduction is loss of image quality. Internet graphics are not always the best quality however reducing file size is a necessary evil to keep visitors from clicking off your site and moving to another. To keep visitors happy your JPEG images must load fast and Photoshop is just the application to help you accomplish that goal. Optimize a JPEG Document Open a document. Click the File menu and then click Save For Web Devices. Click the Original Optimized 2-Up or 4-Up tabs to view the document using different layouts. Click one of the sample images to change its default format. Click the Optimized File Format list arrow and then click JPEG. Select from the following Quality options Compression Quality. Click the list arrow and then select a preset JPEG quality from Low poor quality to Maximum best quality . Quality Amount. Enter a JPEG quality compression value 0 to 100 . The lower the value the more information color is sacrificed for image size. Blur. JPEG images compress better when the image has soft edges. Apply the Blur option to increase the softness of the image at a sacrifice of image quality . Ortflirul Optima 2-Up -U0 6IJ6K Oo e MopomwO W IM pi H pi - Qu 11 Kutut 450 Chapter 19 Click the Matte list arrow and then select from the available options. JPEG images do not support transparency. If your image contains transparent areas use the Matte option to fill them in using a specific color. Select the Optimized check box to further compress the image. Choose from two additional options Progressive. Select the check box to load a JPEG in three progressive scans. Not .