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According to Android definitions, I've found that:
Resolution: The total number of physical pixels on a screen
Density: Based on the screen resolution, the spread of pixels across the physical width and height of the screen.
How can I understand better the differences between the two definitions?
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These two acronyms are often used interchangeably although they do have different meanings. PPI (Pixels Per Inch) refers display resolution, or, how many individual pixels are displayed in one inch of a digital image. DPI (Dots Per Inch) refers to printer resolution, or, the number of dots of ink on a printed image.
You should know that a higher resolution also means more work for your graphics card to render. The larger the resolution, the more pixel density, the better graphics card you'll need to run your game.
Density refers to how many pixels have been physically squeezed into a 1 inch x 1 inch area. In digital displays / screens like monitors, phones, and tablets, density measurement unit is PPI (pixels-per-inch).
A term that refers to the number of pixels on a display or in a camera sensor (specifically in a digital image). A higher resolution means more pixels and more pixels provide the ability to display more visual information (resulting in greater clarity and more detail).
Resolution is a measure of how many pixels a display can show at a time eg. 640x480. Density is a measure of how big each pixel is in actual units. This relates heavily to screen size eg. 640x480 on a 15' display.
When comparing one device's resolution to another, it's a straight-forward comparison: the higher the resolution, the more information you can display at a time. When comparing density: the higher the density the sharper the display will appear.
If you have high resolution and low density, then your screen will be very large. On the other hand, low resolution and high density will result in a very small screen.
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Resolution is about how many pixels you can show on screen.
Density is based on your device real size, if it's small and has a higher resolution, than the density is high cause you show more pixels in less physical space.
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