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Listing 4-1. Generating an Image Containing Every Color import pygame pygame.init() screen = pygame.display.set_mode((640, 480)) all_colors = pygame.Surface((4096,4096), depth=24) for r in xrange(256): print r+1, "out of 256" x = (r&15)*256 y = (r>>4)*256 for g in xrange(256): for b in xrange(256): all_colors.set_at((x+g, y+b), (r, g, b)) pygame.image.save(all_colors, "allcolors.bmp") Listing 4-1 is unusual for a Pygame script because it is not interactive. When it runs you will see it count from 1 to 256 and then exit after saving the bitmap file in the same location as the script. Don t worry that it is slow; generating bitmaps one pixel at a time is something you should never need to do in a game!

Systems using Network File System (NFS) root file systems have an additional twist in the booting process. Because NFS file systems require a working network stack, one adapter must have an IP address. You set the IP address with the IP kernel parameter, which has the following format: ip= host-ip : server-ip : gw-ip : netmask : hostname : device : auto-configure A typical line looks like the following when you specify an IP address ip=10.0.0.1:10.0.0.2:10.0.0100:255.0.0.0:theboard:eth0:off

5. Work your way through the contents of the Previous Version folder and locate the file or files you want to restore, and then copy and paste them onto your computer.

or like this when you use DHCP to obtain IP information: ip=:::::eth0:dhcp Table 7-1 breaks this down and explains each parameter.

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You are probably familiar with how colors are created with paint. If you have a pot of blue paint and a pot of yellow paint, then you can create shades of green by mixing the two together. In fact, you can produce any color of paint by mixing the primary colors red, yellow, and blue in various proportions. Computer color works in a similar way, but the primary colors are red, green, and blue. To understand the difference we need to cover the science behind color don t worry, it s not complicated. To see a color, light from the sun or a bulb has to bounce off something and pass through the lens in your eye. Sunlight or artificial light from a bulb may appear white, but it actually contains all the colors of the rainbow mixed together. When light hits a surface, some of the colors in it are absorbed and the remainder is reflected. It s this reflected light that enters your eye and is perceived as color. When colors are created in this way, it is called color subtraction. Computer screens work differently. Instead of reflecting light, they generate their own and create color by adding together red, green, and blue light (a process known as color addition). That s enough science for the moment. For now we need to know how to represent color in a Python program, because it is impractical to think of names for all 16.7 million of them!

The IP address to assign to the board. This isn t required. In its absence, the kernel doesn t assign an IP address but still attempts to initialize the adapter. The IP address of the host with the NFS file system that will be mounted as root. Optional, because a server IP address can be supplied in the nfsroot parameter in the following section. The network s gateway IP address. Optional. When absent, the kernel doesn t attempt to route packets that aren t on the local network. Indicates what parts of an address are network and which identify a machine. In the example, the first 8 bits identify the network, and the remaining can be used to identify a machine. When not supplied, the kernel attempts to calculate a netmask based on the IP address. If the network address fits into the class A, B, or C range, it picks the right netmask automatically. The text name given to the host. A synonym for the IP address. Optional. The device name that is autoconfigured. No \dev is necessary. Required. This tells the kernel the hardware device to which to apply the prior parameters. When off, the kernel doesn t attempt to use BOOTP or DHCP to get IP address information. This doesn t turn off the adapter. Optional. Default is BOOTP, which can result in the other parameters being overwritten with data from a BOOTP or DHCP server. 4

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