What is the image resolution and related matters?
Source: Internet - on 11-Dec-2019
1. What is the image resolution?
The term "resolution" - that is, the resolution in dpi - (dots per inch) is the number of points per square inch. For example, a resolution of 300 dpi means that on an area of 1 inch, there are 300 small "squares". Or the 72 dpi resolution has 72 "squares" per inch. More generally, the higher the resolution of the image, the more detailed and smooth it will appear on the website or printed page.
Therefore, some lofty-resolution images may contain more pixels than can be seen by the naked eye.
2. So, what are Pixels and Megapixels?
A pixel is meant to be a tiny block of color and is also the most basic unit to create a quality digital photo. Accordingly, a digital photo can be created by shooting methods or by a graphical method, made from thousands or millions of individual pixels.
The more pixels a photo has, along with the larger resolution, the more detailed it becomes. One million pixels would be equal to 1 megapixel. Therefore, a 3.1 megapixel digital camera can capture images containing more than 3 million pixels.
In most graphic applications, the resolution of the image in pixels dimensions can be expressed concerning the previous horizontal measurement. For example: An image whose size is 2592 x 1944 will have 2,592 pixels on the horizontal line and 1,944 pixels on the vertical line. When you multiply these two numbers, there will be 5,038,848 pixels or a resolution of 5 megapixels.
3. The relationship between image resolution and file size
In general, the more megapixels images are, the more memory is needed on the hard drive or on the storage website. However, the image format you choose to save the image also affects its size.
For example: A 3.1 megapixel digital photo will be saved in JPEG format with a low compression level that takes up about 600 KB of hard drive space. In contrast, images saved in uncompressed TIFF format will take up 9 MB of storage space.
4. The relationship between resolution and image size
Usually, the larger the image, the more it takes up storage space, but also appears on the computer screen or when printed.