TAILIEUCHUNG - UNIT 2. FORMATS FOR ELECTRONIC DOCUMENTS AND IMAGES LESSON 8. FORMATS OF ELECTRONIC PICTURESNOTE

In fact, if you use large images the document download and transfer could be slowed down. On the other hand, the higher the quality, the larger the image becomes. In this lesson, you will learn how to balance these two factors. Let’s start with the basic concepts | Information Management Resource Kit Module on Management of Electronic Documents UNIT 2. FORMATS FOR ELECTRONIC DOCUMENTS AND IMAGES LESSON 8. FORMATS OF ELECTRONIC PICTURES NOTE Please note that this PDF version does not have the interactive features offered through the IMARK courseware such as exercises with feedback pop-ups animations etc. We recommend that you take the lesson using the interactive courseware environment and use the PDF version for printing the lesson and to use as a reference after you have completed the course. FAO 2003 2. Formats for electronic documents and images - 8. Formats of electronic pictures - page 1 Objectives At the end of this lesson you will be able to understand the main characteristics of digital images identify the features of the main Bitmap and Vector-based image formats and understand the principle of conversion between different image formats. Electronic pictures are electronic snapshots taken of a scene or scanned from documents such as photographs manuscripts printed texts and art works. When you insert images in an electronic document you need to consider two main factors the quality of the image and its size in Kb. In fact if you use large images the document download and transfer could be slowed down. On the other hand the higher the quality the larger the image becomes. In this lesson you will learn how to balance these two factors. Let s start with the basic concepts. 2. Formats for electronic documents and images - 8. Formats of electronic pictures - page 2 I Bitmap 0 1 The photograph or scanned image is sampled and mapped as a grid of dots or picture elements pixels . Each pixel is assigned a position and a tonal value black white shades of gray or colour which is represented in binary code zeros and ones . For example in a black and white image without grays each pixel is assigned 0 for black or 1 for white . The binary digits bits for each pixel are stored in a sequence by a computer and are often reduced to a .

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