What is megapixel in camera | Image resolution | Why iPhone has better quality than other phones

What is megapixel in camera ?
What Are Pixels?

The dots on a TV, video projection screen, PC monitor, laptop, or even tablet and smartphone screens, are referred to as pixels.
A pixel is defined as a picture element. Each pixel contains red, green, and blue color information (referred to as subpixels). The following illustration shows a close-up of subpixels.


what is a mega pixel ?

When you zoom an image, till its smallest unit or single building block element called a pixel. Each pixel contains either red, green, and blue color information. So when you combined 1 Million PIXELS together that is called 1 MEGA pixel, so it forms a 1 mega pixel image.

What is image resolution ?
The number of pixels that can be displayed on a screen surface determines the resolution of the displayed images. To display a specific screen resolution, a predetermined number of pixels has to run across the screen horizontally and up and down the screen vertically, arranged in rows and columns. To determine the total number of pixels covering the entire screen surface, you multiply the number of horizontal pixels in one row with the number of vertical pixels in one column. This total is referred to as pixel density.


Resolution VS Quality
Resolution is one aspect of quality and far from the most important. Sharpness (which is a subjective quality) is more important than resolution in determining overall quality. Sharpness can be estimated by integrating the area under the MTF curve.


Other aspects of image quality include:
Image content (including lighting)
tone-scale (including macro and local contrast)
color reproduction (including hue accuracy and saturation)
noise (for film, this was called graininess)

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