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Unit 3.1 Multimedia Basics

Using Graphics

Graphics can be used in multimedia applications as backgrounds, buttons, icons, navigational items, colors, maps, and charts; illustrations to explain concepts, information, and moods; and logos to communicate corporate image. In addition, once images are in a digital format, image-editing software such as Adobe Photoshop can be used to edit and manipulate them even further. Using image-editing software, multimedia developers can combine text and images to create almost any work of art they can imagine. In order to be used in a multimedia application, images must be in a digital format. Digitizing is the process of converting images into a format that the computer can recognize and manipulate. In other words, the image is converted into a series of binary data or 1's and 0's. There are many different sources of preexisting digitized images, or you can digitize images that are currently photographs, slides, or line art. When deciding upon an appropriate resolution for your image, keep in mind that a higher resolution will display a superior image, but it will also result in a larger file size. This means the file will require more storage space and it will take longer to display. In other words, there is a trade-off for higher resolution images. For example, when creating images for Web pages, we must be willing to give up some quality in order to ensure that the graphic file sizes are small enough to download quickly at 500K to I000K. Because graphic files take up a lot more storage space than text, it is quite easy to run out of disk space or to spend a significant amount of time waiting for graphic files to transfer or download. For these reasons, you may find it necessary to compress your image files.

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