tailieunhanh - Tài liệu Photoshop cs5 by Dayley part 8

Hình ảnh Khái niệm cơ bản Mục đích của hotoshop là chỉnh sửa các file hình ảnh đó đã đến từ nhiều nguồn khác nhau. Photoshop hỗ trợ một số lượng lớn các định dạng tập tin. Các định dạng file khác nhau có thể gây nhầm lẫn, vì vậy chương này dành một chút thời gian nói về mỗi định dạng file khác nhau để giúp bạn hiểu được một số lợi ích và hạn chế của mỗi người. Trong chương này, bạn cũng tìm hiểu một số khái niệm quan trọng khác về kích thước file và độ phân. | CHAPTER Image Basics Photoshop s purpose is editing image files that have come from a variety of sources. Photoshop supports a large number of file formats. The different file formats can be confusing so this chapter spends a bit of time talking about each of the different file formats to help you understand some of the benefits and drawbacks of each one. In this chapter you also learn some other important concepts about file size and resolution. Understanding the relationship among the file size the resolution and the ultimate destination of the file helps you know what size and resolution to use for an image. You also learn the different types of algorithms that Photoshop uses to resample images when changing the size. Understanding the algorithms helps you know which ones to use to get the best results when resizing images. This chapter also discusses how and why to crop images. You learn how to use several tools in Photoshop to quickly and accurately crop trim rotate and straighten images. Exploring File Types If you have worked with images long enough you have probably come across a variety of file formats. Although having just one file format would be great the fact is that numerous file formats serve a variety of purposes. You need to understand the different type of image video and 3D file formats to really make the most of Photoshop s features. Understanding the different file formats helps you make better decisions about how to save and work with files. IN THIS CHAPTER Understanding the file formats that Photoshop supports for images video and 3D objects Knowing the difference between raster and vector images Opening an image in another format Understanding the resizing algorithms Creating a border around an image Cropping and straightening images Removing a border from an image 63 Part I Getting Started with Adobe Photoshop CS5 This following sections focus on helping you understand the different types of file formats where they came from and why to use