Photoshop: Color and Image

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Basic concepts and terminology The Photoshop is a tool for photograph retouching, enhancing and will give you flexible features to produce stunning images which can be put in Web pages. If you have not fully understood the coloring of your images, you have go through the chapter on Basic Concepts. Basic Concepts What is computer graphics? There are two main types of computer graphics- vector and raster images. Vector images, such as those created in Adobe Illustrator, are made up of mathematically defined lines and curves called vectors. Raster images, such as those created in Adobe Photoshop, consist of a grid, or raster, of small squares, known as pixels. Several types of resolutions are important when working with digitized images. They…show more content…
Screen frequency is the resolution of the screen you will use when you print your final image. As a general rule, the image resolution should be twice the screen frequency to achieve the best printed results. To estimate scan resolution: 1. Multiply the longest dimension of the final image size by the screen frequency, then multiply this value by the ratio of the screen ruling (which is 2:1). Suppose you are now scanning an image that is 4 inches wide by 5 inches high. You are going to produce a final image that is 5 inches wide by 6 inches high. You are using a screen frequency of 150 lpi. 2. Multiply 6 (the longest output dimension) by 150 (screen frequency) to get 900 pixels. Then multiply 900 by 2 (the ratio of the screen). This equals to a total of 1800 pixels needed. 3. Divide the total number of pixels by the longest dimension of the original image. Here, the longest dimension of the original image is 5 inches. Dividing 1800 by 5 yields a scan resolution of 360 dpi. Importing images into Photoshop: The following image file formats are allowed: Photoshop 2.5 and 3.0 native formats, Adobe Illustrator, Amiga IFF and HAM, BMP, Compuserve GIF, EPS, JPEG, Kodak PhotoCD, Mac Paint, PCX, PICT file (raster only), PIXAR, Pixel Paint, Raw, Scitex CT, Targa and TIFF. Among the above file formats, some of them are
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