Anti-aliasing

Anti-Aliasing

Anti-aliasing is a method of reducing the “jaggies,” a staircase-like effect also called aliasing that appears along slanted lines on computer images. Anti-aliasing works by creating color values that are intermediate between the object color and the background color, and then using those values to fill in the steps of the staircase.

The disadvantages of anti-aliasing are that file size increases and you get intermediate colors along the edges of your objects.

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concept of virtual machine

virtual machine

 A computer system is made up of layers. The hardware is the lowest level in all such systems. The kernel running at the next level uses the hardware instructions to create a set of system calls for use by outer layers. The system programs above the kernel are therefore able to use either system calls or hardware instructions, and in some ways these programs do not differentiate between these two.  By using CPU scheduling and virtual-memory techniques an operating system can create the illusion that a process has its own processor with its own (virtual) memory. The virtual-machine approach, does not provide any additional functionality, but rather provides an interface that is identical to the underlying bare hardware. Each process is provided with a (virtual) copy of the underlying computer The physical computer shares resources to create the virtual machines.

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Shell Script

The Programs written in shell language are known as shell script or shell procedures, which are just a sequence of commands in a file. Shell script can save your lot of time, if you want to repeat a sequence of commands over and over. The shell language also provide variables, control structures such as looping etc.

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Unix Operating System

Unix is a multi-user, multi tasking operating system.It offers a number of features that make it powerful, versatile and effective.  such as:-

• Hierarchical File system
• File Access control
• Compactness and efficiency
• Networking
• Portability etc.

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