Resolution images usually refers to the number of pixels (the smallest element of a digital photo that has the color and brightness information). The more pixels, the data in a digital photograph and its capacity increased.
The number of pixels is calculated by multiplying the number of pixels horizontally and vertically. There is also another definition resolution, which is based on the pixel density (pixels per inch / ppi). This resolution is also called spatial resolution in determining the sharpness of the image.
How to change the image resolution can be done by using the software if the digital photograph. The simplest is to use MS Paint application is usually included in the Windows operating system.