Each pixel is a sample of an original image; more samples typically provide more accurate representations of the original. The intensity of each pixel is variable. In colour image systems, a colour is typically represented by three or four component intensities such as red, green, blue, cyan, magenta, yellow and black.
A computer running 800X600 pixel resolution will display 800 pixels in the width of the monitor and 600 pixels in height
If you had two 17 inch computer monitors showing the same web page on the screen but running at different monitor resolutions. The pixels on the monitor set at lower resolution (800X600 pixel monitor resolution) will be larger than the pixels on the monitor set to higher resolution since there will be only 800 pixels across the 17 inch monitor rather than 1024 in that same 17 inch space with 1024X768 pixel monitor resolution.
Image Resolution
Resolution is number of pixels in an image. Resolution is identified by the width and height of the image as well as the total number of pixels in the image. The resolution of an image is measured in dots per inch (dpi), or pixels per inch (ppi). The dpi determines the amount of detail the image has.
When you change computer monitor resolutions you DO NOT change the pixel dimensions of the pictures and content on the monitor. Therefore, the monitor running lower resolution has larger pixels and will have larger images and text.
Megapixels is the maximum pixel resolution available in a digital camera. Megapixel resolution is the cameras CCD's length and width pixel resolution. A camera with a 1536 by 2048 pixel CCD has round about 3.1 megapixel maximum image resolution
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