Working with Images in .NET framework

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7 Working with Images
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In viewing and manipulating images, GDI+ provides significant improvements over its predecessor, GDI In this chapter we will discuss the following topics:
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Basic imaging-related classes defined in the NET Framework library The difference between raster and vector images The Image class, its properties, and its methods Writing an image viewer application Opening and viewing images Retrieving image properties Creating thumbnails Rotating and flipping images Zooming in and out on images Saving and skewing images Changing the resolution and scaling of images Playing animated images The Bitmap class, its properties, and its methods Using the Icon class to work with icons Drawing transparent images Using the PictureBox control to draw images
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As we said earlier, the graphics-related functionality in the NET Framework class library is defined in the SystemDrawing namespace and its helper namespaces The imaging functionality is divided into two categories by separation into two namespaces Basic imaging functionality is defined in the SystemDrawing namespace; advanced imaging functionality is defined in theSystemDrawingImaging namespace This chapter covers the former; 8 will focus on the latter
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71 Raster and Vector Images
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The graphics world divides images into two types: raster and vector A raster image (also called bitmap) is a collection of one or more pixels Each pixel of the image can be controlled individually, which means that each pixel of the image can have a different color or shade In a raster image that contains a line and a rectangle, the line and rectangle are each a sequence of pixels Raster images require higher resolutions and anti-aliasing for a smooth appearance and are best suited for photographs and images with shading A vector image is a collection of one or more vectors Mathematically, a vector is a combination of a magnitude and a direction, which can be used to represent the relationships between points, lines, curves, and filled areas In vector images, a vector is the entity to be controlled Each vector can have a separate color or shade So a vector image with a line and a rectangle is a set of vectors in which each vector has different properties, such as color or shade Vector graphics are mathematically described and appear smooth at any size or resolution, and they are often used by mechanical and architectural engineers Vector images can be transformed from one state to another without any loss of data Transforming raster images, however, may cause data loss or reduce the quality of images For example, in the zoomed raster image shown in Figure 71, the outer boundary of the image is blurry
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Figure 71 A zoomed raster image
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In the zoomed vector image of Figure 72, however, the outer boundary of the image is sharper
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Figure 72 A zoomed vector image
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711 Raster Image Formats
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A bitmap is usually stored in an array of bits that specify the color of each pixel in a rectangular array of pixels The bitmap's height and width are measured in pixels The number of bits per pixel specifies the number of colors that can be assigned to that pixel, according to the equation
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Bp Nc=2
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where
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Nc = the number of colors that each pixel can display
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Bp = the number of bits per pixel
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8 24 For example, if Bp = 8, then Nc = 2 = 256 colors IfBp = 24, then Nc = 2 = 16,777,216 colors Table 71 shows the number of bits and number of possible colors that can be assigned to a pixel Bitmaps with 1 bit per pixel are called monochrome images Monochrome images generally store two colors: black and white
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712 Graphics File Formats
There are many bitmap image formats, including the following:
BMP GIF JPEG EXIF PNG TIFF
7121 BMP
BMP is a standard Windows format to store device-independent and application-independent bitmap images The number of bits per pixel (1,
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4, 8, 16, 24, 32, or 64) for a given BMP file is specified in a file header BMP files with 24 bits per pixel are common