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Bitmaps can occupy a lot of memory, which can create problems in a memory-scarce environment such as Windows CE When placing bitmaps in resources, we recommend that you test different formats and use the smallest one To provide a starting point, we conducted some tests with three 100 100-pixel images stored in different formats Table 1110 summarizes our results, which provide the size in bytes for each image file
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27 The only situation requiring a call to the Dispose method is to release a Graphics object obtained in a control by calling the CreateGraphics method
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TABLE 1110: Size Comparison for Three 100 100 Images in Various Image File Formats
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Monochrome DIB 16-color DIB 256-color DIB True-colorDIB GIF PNG JPEG
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1 4 8 24 8 8 24
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1,662 5,318 11,078 30,054 964 999 823
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1,662 5,318 11,078 30,054 3,102 616 3,642
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Four formats are uncompressed and three are compressed The first four entries in the table are for DIB files This well-known format is thoroughly documented in the MSDN Library and is the format that Visual Studio NET provides for creating bitmap images Notice that the size of these images is the same for a given number of bits per pixel This reflects the fact that DIB files are uncompressed The last three formats are the compressed formats: GIF, PNG, and JPEG To make sense of these formats, we must discuss the contents of the three images The single-color image was a solid black rectangle Each of the three compressed formats easily beat any of the uncompressed formats for the single-color image The reason is that compressed formats look for a pattern and use that information to store details of the pattern A single color is a pretty easy pattern to recognize and compress The second column, the multicolor image with regular data, shows the results for an image created with a solid background and vertical stripes We used vertical stripes in an attempt to thwart the compression because run-length encoding of horizontal scan lines is an obvious type of compression We were surprised (and pleased) to find that PNG compression was able to see through the fog we so carefully created it created the smallest image in the table The third column, the multicolor image with irregular data, shows the sizes for images created with very random data For this test, we copied
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113 Raster Graphics
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text (NET Compact Framework source code) into an image file (We never want our work to be called random, but we wanted an irregular image to push the envelope for the three compression formats) The result was more like a photograph than any of the other images, which is why JPEG the compression scheme created for photographs was able to provide the best compression It provided the smallest file size with the least loss of information (the monochrome image was smaller, but the image was lost) To summarize, the two compression schemes that created the smallest image files were PNG (for regular data) and JPEG (for irregular data) One problem is that Visual Studio NET does not support either of these formats But Microsoft Paint (mspaintexe) supports both, so we recommend that you make sure your images have been compressed as much as possible prior to embedding your images as resources
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1134 Drawing Bitmaps The Graphics class supports four overloaded versions of the bitmap drawing method, DrawImage These alternatives support the following types of bitmap drawing:
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Drawing the entire bitmap at the original image size Drawing part of a bitmap at the original image size Drawing part of a bitmap with a change to the image size Drawing part of a bitmap with a change to the image size and with
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