Apress image magick by Michael Still PDF

By Michael Still

ISBN-10: 1590595904

ISBN-13: 9781590595909

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Resampling an Image Another way of resizing an image is called resampling. Resampling is interesting in that it doesn’t change the size of the image; it changes the resolution of the image. So, for example, if you have an image that is two inches wide and three inches high at 100 dots per inch, then it will be 200×300. If you resample the image to 300 dots per inch, then you’ll change the image to be 600×900 pixels. The observed size of the image won’t change, though. You’d use this conversion so that the image would print and display correctly on devices with varying resolutions.

These components fall into two overall categories—modules and delegates. Modules are ImageMagick’s code for handling a given image format. When a dependency isn’t available at compile time, then that module will be disabled. Delegates are an extremely similar concept, but delegates are also extensible. You’ll notice that I’ve already discussed delegates when showing how to compile from source. The “Introducing Delegates” section covered the delegates that ship by default with ImageMagick. qxd 11/17/05 3:06 PM Page 23 CHAPTER 1 ■ INSTALLING AND CONFIGURING IMAGEMAGICK next section, “Using Configuration Files,” for more information on adding delegates to ImageMagick, and to Chapter 9, which discusses how to write a simple delegate of your own in C.

You can also add your own delegates to the mix by using the delegate configuration file, which is discussed in the “Using Configuration Files” section. Chapter 9 also contains an example of a custom delegate. For now, I’ll stick to listing the delegates that ImageMagick supports so that you know what you might want to install before you compile ImageMagick from source (see Table 1-1). Table 1-1. qxd 10 11/17/05 3:06 PM Page 10 CHAPTER 1 ■ INSTALLING AND CONFIGURING IMAGEMAGICK Table 1-1. org/zlib/ Each of these delegates is open source and can be separately downloaded and installed before ImageMagick is configured if you need the facilities it implements.

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Apress image magick by Michael Still


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