Lưu tập tin trên Web Tối ưu hóa là quá trình mà theo đó các tập tin được chuẩn bị để xem trực tuyến, trong định dạng cụ thể, kích thước lưu trữ, và các thông số màu sắc. Khi cài đặt lựa chọn đầu ra cho Web như trái ngược với bản in đầu ra, các vấn đề của kích thước tập tin và truyền tải các dữ liệu đi vào chơi. Mục đích là để nén các file của bạn đủ mà họ tải về một cách nhanh chóng trên Web trong khi vẫn giữ chất lượng càng cao. | Export 421 Saving files for the Web Optimization is the process by which files are prepared for online viewing within specific format storage size and color parameters. When choosing settings for Web output as opposed to print output issues of file size and the transmission of data come into play. The goal is to compress your files enough that they download quickly on the Web while keeping their quality as high as possible. Two main parameters that you ll need to focus on as you do this are the file size and the file format GIF or JPEG . File size The length of time it takes for an image to load into a Web page is related directly to its file size. The size of the optimized file in turn is determined by the dimensions of the image in pixels and the amount and kind of compression that is applied to it. When choosing dimensions for an image if you keep in mind that most people view the Web in a browser window that s around 1000 pixels wide you can consider dimensions of 800 x 600 pixels to be a realistic upper limit. Remember also that Web browsers always display images at 100 magnification. In the Save for Web Devices dialog you will be able to specify pixel dimensions for the optimized file and preview the results. The GIF and JPEG formats cause a small reduction in image quality as they apply compression but the resulting smaller file sizes download more quickly on the Web so it s a worthwhile trade-off. Bear in mind that some types of images are more compressible than others. For example a document with a solid background color and a few solid-color shapes will compress much more than a large document that contains many color areas textures or patterns. The JPEG format has more compression power than GIF. File formats GIF and JPEG the two file formats most commonly used for Web graphics are best suited for different types of Photoshop documents GIF GIF preserves flat colors and sharp edges such as type better than JPEG but it s an 8-bit format meaning it can save
