A Relation Between Distance and Radial Velocity Among by Hubble E.

By Hubble E.

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The next step is simply to compile ImageMagick, like so: make Now you just need to install the compiled code, which you can do with this command: make install This final command is the only one that requires you to have administrative permissions on your computer because it installs to privileged areas of the system. Installing Using FreeBSD Ports Installing on the FreeBSD platform is simple if done through the ports tree. It’s highly recommended that you use the ports tree unless you have some need for a custom compilation of ImageMagick.

Making an Image Smaller Let’s say you just took the picture shown in Figure 2-5 with your digital camera, and now it’s time to post it online. It’s a nice full-resolution image, because you want one day to be able to do some pretty exciting things with the pictures you take, such as printing full-sized posters and projecting them onto walls in your home or office. 35 36 CHAPTER 2 ■ PERFORMING BASIC IMAGE MANIPULATION Figure 2-5. A sample photograph for resizing I took this photo a while ago on a 2-megapixel camera, so posting it online wasn’t a big problem, although I did make it smaller so that it would fit on the smaller monitors that many members of my family used at the time.

Jpg Cropping an Image Another way to reduce the size of an image is by cropping it. Cropping is where you take a subsection of an image and remove everything surrounding that portion of the image. For example, let’s say you want to change the photo of a tree to include just the top of the tree, as shown in Figure 2-10. Figure 2-10. The top part of the tree To achieve this with ImageMagick, you need to specify the intended width and height of the new image and the top-left corner of that new image within the original image.

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