What are the Basic Elements of an Image?

1. Pixel: It is the most basic element of an image. It is basically a colored dot on the screen. A computer image consists of these pixels arranged in rows and columns.
   
2. Resolution: It is basically the number of pixels(width x height) displayed in an image. Some of the most common screen resolutions are 320 x 200, 640 x 480, 800 x 600, 1024 x 768 etc…
   
3. Aspect Ratio: It is defined as the ratio of Pixel’s width to the Pixel’s height. This ratio is being calculated because not all images are square. In 640 x 480, 800 x 600, and 1024 x 768 mode, the Aspect Ratio is 1:1 or 1, i.e. the pixels are perfectly square.
   
4. Colors: Each color consists of 3-basic colors: Red, Green and Blue(RGB). An RGB value is the mixture of Red, Green and Blue to make other colors.
   
5. Number of Colors: It is also known as Color Depth. It describes how many colors can be displayed on your screen at once. It is described in terms of bits and referes to the amount of memory used to represent a single pixel. eg. 8-bit, 16-bit, 24-bit, 32-bit and 64-bit color.