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Probably more than anything else, the Internet has fueled the average computer user s need for visual stimuli. Web sites are awash with GIF, JPG, TIFF, and a variety of other image formats. Even if you deal with non-web applications, it s likely that you, as a programmer, will come into more frequent contact with graphical images. Fortunately, GDI+ includes features that let you manage and manipulate these images with ease. The BMP file format is the native bitmap format included in Microsoft Windows, but it s not all that common in the web world. But none of that matters to GDI+. It can load and manage files using the following graphics formats: Windows BMP bitmap files of any color depth and size. CompuServe Graphics Interchange Format ( GIF ) files, commonly used for non-photo images on the Internet. Joint Photographic Experts Group ( JPEG ) files, commonly used for photos and other images on the Internet. JPEG files are compressed internally to reduce file size, but with the possible loss of image quality. Exchangeable Image File ( EXIF ) files, a variation of JPEG that stores professional photographs. Portable Network Graphics ( PNG ) files, which are similar to GIF files, but with some enhanced features. Tag Image File Format ( TIFF ) files, which are kind of a combination of all other file formats. Some government organizations store scanned images using TIFF. Metafiles, which store vector line art instead of bitmap images. Icon ( ICO ) files, which are used for standard Microsoft Windows icons. You can load them as bitmaps, but there is also a distinct Icon class that lets you treat them in more icon-like ways. Three primary classes are used for images: Image (an abstract base class for the other two classes), Bitmap, and Metafile. I ll discuss the Metafile class a little later.
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Bitmaps represent an image as drawn on a grid of bits. When a bit in the grid is on, that grid cell is visible or filled. When the bit is off, the grid cell is invisible or empty. Figure 18-7 shows a simple image using such a bitmap grid.
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Since a bit can support only two states, 1-bit bitmap files are monochrome, displaying images using only black and white. To include more colors, bitmaps add additional planes. The planes are stacked on each other so that a cell in one plane matches up with that same position cell in all other planes. A set of eight planes results in an 8-bit bitmap image, and supports 256 colors per cell (because 2planes = 28 = 256). Some images include as many as 32 or even 64 bits (planes), although some of these bits may be reserved for alpha blending, which makes perceived transparency possible. Unless you are a hardcore graphics junkie, manipulating all of those bits is a chore. Fortunately, you don t have to worry about it since it s all done for you by the Bitmap class. You just need to worry about loading and saving bitmaps (using simple Bitmap methods, of course), using a bitmap as a brush or drawing object (as we did in some sample code in this chapter already), or writing on the bitmap surface itself by attaching a Graphics object to it. If you have a bitmap in a file, you can load it via the Bitmap class constructor.
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Dim niceImage As New Bitmap("LookupItem.bmp")
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To save a bitmap object to a file, use its Save method.
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niceImage.Save("LookupItem.jpg", Imaging.ImageFormat.Jpeg)
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Another constructor lets you create new bitmaps in a variety of formats.
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' ---- Create a 50-50 pixel bitmap, using 32 bit-planes ' (eight each for the amounts of red, green, and blue ' in each pixel, and eight bits for the level of ' transparency of each pixel, from 0 to 255). Dim niceImage As New Bitmap(50, 50, _ Drawing.Imaging.PixelFormat.Format32bppArgb)
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