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Thay đổi kích thước tập tin và điều chỉnh Nghị quyết Sau khi bạn mở file trong Photoshop, bạn đã sẵn sàng để bắt đầu chỉnh sửa nó. Một số những người đầu tiên chỉnh sửa bạn muốn thực hiện được những điều chỉnh thay đổi kích thước và độ phân giải để làm cho hình ảnh kích thước bạn muốn | Part I Getting Started with Adobe Photoshop CS5 FIGURE 3.5 Using the Save As dialog box to save changes made to an image in Photoshop Resizing Files and Adjusting Resolution After you open the file in Photoshop you are ready to begin editing it. Some of the first edits you want to perform are the resizing and resolution adjustments to make the image the size you want. This section discusses resolution and how it applies when you are resizing images. Understanding resolution Resolution is the ability to discern details in an image. In Photoshop resolution is measured in terms of pixels inch or pixels cm. In practice an image with more pixels per inch has more detail. The biggest limitation of resolution is the medium on which the image is presented. For example a typical computer monitor has a maximum resolution between 72 and 96 pixels inch which means that even if you have 1000 pixels inch in an image the detail cannot appear better than at 96 pixels inch. 78 Chapter 3 Image Basics Therefore when setting the resolution of an image you should understand resolution capabilities of the medium from which the image will be outputted. For example an inkjet printer may be able to print 300-1200 dpi dots inch so a file with a resolution of 1000 dots inch prints more detail than an image that contains only 96 dots inch. So why not just keep the resolution at the maximum There are two reasons. First the more resolution in the image the larger the file is. If disk space is of concern then reducing the resolution helps. Second if you are using the image in an application or function that requires a specific resolution range such as a Web image you need to change the resolution to match those requirements. Tip It is a good practice to always maximize the resolution when editing an image until you are ready to output it. That way all the editing is done with the maximum amount of detail. Also if you plan to edit the image again you should consider keeping a copy with the higher
