What is the unit of pixels? What is the abbreviation of this word?

The unit of pixels is usually PPI, which is the abbreviation of pixels per inch.

When the picture size is in pixels, we need to specify its fixed resolution in order to convert the picture size into the actual size in reality. For example, the resolution of the most commonly used pictures in web pages is 72, that is, 7265438 pixels per inch +0 inch equals 2.54 cm, then it can be concluded that each cm equals 28 pixels through conversion; Another example is a picture with the length of 15x 15cm, which is equal to the length of 420*420 pixels.

Dots per inch DPI

LPI line per inch

PPI pixels per inch

Pixels are called picture elements in Chinese. Pixel is only the size unit of resolution, not the image quality.

According to the definition, pixel refers to the basic primary color pigment and the basic coding of its gray level. Pixel is the basic unit of a digital image, and the resolution of the image is usually expressed in pixels per inch (PPI).

For example, a resolution of 300x300PPI means that the number of pixels per inch is 300 both horizontally and vertically, or it can mean that there are 90,000 (300x300) pixels per square inch.

Like photographic photos, digital images have continuous shadows. If you enlarge the image several times, you will find that these continuous tones are actually composed of many small squares with similar colors, which are the smallest unit of the image-pixels. This smallest graphic unit usually displays a single coloring point on the screen. The higher the pixel, the richer the sample and the more realistic the color is.

principle

Several other concepts, such as voxel, texture element and surface element, are all derived from the concept of pixel and used in other computer graphics and image processing applications.

Dots are sometimes used to represent pixels, especially for computer marketers, and most of the time they are represented by DPI (dots per inch).

We can say that pixels in a visible image (such as a printed page) are pixels represented by electronic signals, pixels represented by numbers, pixels on a display, or pixels in a digital camera (photosensitive element). Many other examples can be added to this list, and there will be some more accurate synonyms according to the context, such as pixel, sampling point, byte, bit, point, point, superset, triple, edge set, window and so on.

We can also discuss pixels in the abstract, especially when we use pixels as a measure of resolution (also called resolution, the same below), such as 2400 pixels per inch or 640 pixels per line. Although there is a more specific definition of resolution, the number of pixels in an image is sometimes called image resolution. The more pixels used to represent an image, the closer the result is to the original image.

Pixels can be represented by a number, such as a "0.3 megapixel" digital camera with a rating of 300,000 pixels; It can also be represented by a pair of numbers, such as "640x480 display", which means 640 pixels horizontally and 480 pixels vertically (just like VGA display), so its total number is 640x480 = 307,200 pixels.

The color sampling points of digital images (such as JPG files commonly used in web pages) are also called pixels. Due to the different types of computer monitors, these may not correspond to some areas of screen pixels one by one. In this obviously different area, the points in the image file are closer to the texture elements.

In computer programming, an image composed of pixels is called a bitmap or raster image. The word raster comes from analog TV technology, and bitmap images can be used to encode digital images and some types of computer-generated art. Simply put, a pixel is the value of a point in an image. Points are drawn into lines, and lines are drawn into surfaces. Of course, the clarity of a picture is not only determined by pixels.

Pixel value

The pixel mentioned by the camera actually refers to the maximum pixel, which is the unit of resolution. This pixel value is only the effective maximum resolution supported by the camera.

300,000 640×480

500,000 800×600

806,5438+0024× 768 5 inches (3.5× 5 inches)

1.3 million 1.280× 960 6 inches (4× 6 inches)

2 million 1600× 12008 inches (6× 8 inches) 5 inches (3.5× 5 inches)

365438+ million 2048×153610 "(8×10 inch) 7" (5× 7 inch)

4.3 million 2400× 1800 12 inch (10× 12 inch) 8 inch (6× 8 inch)

5 million 2560× 1920 12 inch (10× 12 inch) 8 inch (6× 8 inch)

6 million 3,000× 200014 "(114 inch)10" (8×10 inch).

8 million 3264× 248816 "(12×16 inch)10" (8×10 inch).

1 1 4080× 2720 20 inches (16× 20 inches) 12 inches (10× 12 inches).

144,536× 3024 24 inches (18× 24 inches) 14 inches (1 1× 14 inches).

All the above are approximate sizes.