What is Resolution-Knowledge Encyclopedia-Shenzhen Kai Mo Rui Electronic Technology Co. LTD

What is Resolution

Source：Shenzhen Kai Mo Rui Electronic Technology Co. LTD2026-06-09

Resolution

Resolution refers to the total number of pixels horizontally and vertically contained in an image or display screen.

For example, a photo with a resolution of 1920×1080 means the picture is composed of 1,920 horizontal pixels and 1,080 vertical pixels, with a total pixel count of 1920×1080.

Features

Resolution determines the level of fine detail in a bitmap image.

Generally speaking, the higher an image’s resolution, the more pixels it contains, resulting in sharper visuals and superior print quality. Meanwhile, higher resolution also increases the storage space occupied by the file.

When you zoom in a high-resolution bitmap, it remains far clearer with less pixelation compared to a low-resolution equivalent under the same magnification.

Units

Common units for measuring resolution include:

dpi (dots per inch)
lpi (lines per inch)
ppi (pixels per inch)

Distinction Between DPI and PPI

DPI: A measurement unit for raster digital imagery, representing the number of sampled, displayable or output dots per linear inch.
PPI: Pixel density unit, indicating the quantity of pixels packed within one inch.

Application Scenarios

PPI and DPI are frequently confused in practice, yet they apply to distinct fields. Technically, "pixels" exist exclusively in digital display systems, while "dots" apply only to printing and hardcopy output workflows.

Relationship Between Resolution and DPI

Take a monitor as an example: its physical screen size is fixed, but display resolution can be adjusted. Lowering the resolution raises the effective DPI, visually enlarging pictures and text. Increasing the resolution conversely shrinks on-screen text and graphics.

Does Resolution Relate to Screen DPI?

Resolution is inherently linked to screen DPI, and screen size together with DPI jointly shape visual output quality.

For instance, a 6-inch 1080P screen delivers poorer clarity than a 4-inch 1080P screen. With identical resolution, a larger panel yields lower pixel density (DPI).

Classification: Image Resolution vs Display Resolution

1. Image Resolution

It denotes the volume of data stored within an image, measured as the number of pixels per inch, with the unit PPI.

2. Display Resolution

This describes a monitor’s output capacity for rendering images, quantified in dots—where each "dot" on a screen equals one pixel.

The numerical value of display resolution stands for total horizontal and vertical pixels across the entire viewable screen area.

A resolution of 800×600, for example, means 800 horizontal pixels and 600 vertical pixels span the full screen, totaling 480,000 pixels.

Scenario 1: Image Resolution > Display Resolution

Two rendering modes are available:

Partial display: The screen only renders pixels matching its own resolution, showing just a cropped section of the full image; users pan up/down/left/right to view the complete picture.
Full-screen fit: The original image pixels are downsampled. A 2560×1600 photo will discard excess pixels to fit a 1920×1080 display. The whole image becomes visible, yet minor fine details are lost.
Case reference: Photos viewed directly on a low-resolution digital camera screen look blurry, but appear much sharper when opened on a higher-resolution computer monitor.

Scenario 2: Image Resolution < Display Resolution

Two rendering modes apply here as well:

Native pixel-for-pixel display: The image renders at its true pixel dimensions, mapping one image pixel to one screen pixel. The picture only occupies a small central area of the screen instead of filling the whole panel.
Full-screen stretch display: Extra blank pixels are interpolated to fill the screen rather than compressing the source image. The graphic blows up to full screen size, yet retains very few effective original pixels, resulting in soft, low-detail visuals.

Previous

Back

Next

News