New PDF release: Apress image magick

By Michael Still

ISBN-10: 1590595904

ISBN-13: 9781590595909

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Yes checking for a BSD-compatible install... /usr/bin/install -c checking whether make sets $(MAKE)... (cached) yes checking maximum warning verbosity option... -Wall for C checking whether ln -s works... yes checking for gcc... (cached) gcc checking whether we are using the GNU C compiler... (cached) yes checking whether gcc accepts -g... (cached) yes checking for gcc option to accept ANSI C... (cached) none needed checking dependency style of gcc... (cached) gcc3 checking if malloc debugging is wanted...

This is best described diagrammatically, as shown in Figure 2-6. Figure 2-6. qxd 11/17/05 3:17 PM Page 37 CHAPTER 2 ■ PERFORMING BASIC IMAGE MANIPULATION You can see here that if you reduce the length of each of the sizes by half, then the total area of the rectangle ends up being a quarter of the previous value. This quite drastically reduces the size of the image file. Table 2-1 shows some real-world data to back up that statement. Table 2-1. 2 megabytes 1,280×960 784 kilobytes 640×480 280 kilobytes 320×240 112 kilobytes 160×120 56 kilobytes 80×60 36 kilobytes You can also see from Table 2-1 that the advantage of reducing the size of an image in terms of side length compared with file size on disk decreases as the image gets smaller.

5555556. Maximum image dimensions: You can specify the maximum size for an image, and the image will be resized only if its dimensions exceed that specification. For example, the following command line will resize only those images bigger than 640×480 pixels, in which case you’ll get an image that is 640×480 pixels. qxd 11/17/05 3:17 PM Page 39 CHAPTER 2 ■ PERFORMING BASIC IMAGE MANIPULATION Minimum image dimensions: Similarly, by changing the less-than sign to a greater-than sign, you can specify that all images should have at least a certain minimum set of dimensions.

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Apress image magick by Michael Still


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