Apress image magick by Michael Still

By Michael Still

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A lot of information, such as photographs and scanned images, cannot be represented well with vector graphics. For example, how would you turn a picture of a tree from your camera into a set of lines and so forth? You can try, but it would take a lot of time and processing effort and probably would not look that good. Raster Images The other option for storing image information is raster images. Imagine that you drew the smiley face from Figure 2-1 on graph paper and insisted that the lines consisted of just colored squares on the grid paper.

Jpg Negation of minimum and maximum sizes: It is also possible to negate the logic applied for the minimum and maximum size operators discussed in the two previous points by placing an exclamation mark before the greater-than or lesser-than sign. This inverts the logic applied for that operation. 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.

For Microsoft Windows, the documentation is installed by default and appears in the ImageMagick folder under Start ➤ Program Files. org. If you’re just wondering what the arguments to a given command-line option are, or what the name of a command-line option is, then you can also try the help command-line option, like so: convert -help This lists all the command-line options supported by that ImageMagick utility and provides a one-line description of each. qxd 28 11/17/05 3:06 PM Page 28 CHAPTER 1 ■ INSTALLING AND CONFIGURING IMAGEMAGICK Debug Output ImageMagick provides extensive debugging output if you add the debug command line to the command you’re executing.

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