Resolution is the accuracy of the screen image, which refers to the number of points that the display can display. Because the points, lines and surfaces on the screen are all composed of points, the more points the display can display, the finer the picture will be, and the more information can be displayed on the same screen area, so resolution is one of the very important performance indicators. The whole image can be imagined as a big chessboard, and the resolution is expressed by the number of intersections of all warp and weft.
For a screen with a resolution of 1024×768, that is, each horizontal line contains 1024 pixels, * * * has 768 rows, that is, the number of scanning columns is 1024 and the number of rows is 768. The resolution is not only related to the size of the display, but also affected by factors such as the distance between picture tubes and video bandwidth. Among them, it is closely related to refresh frequency. Strictly speaking, only when the refresh frequency is "flicker-free refresh frequency" can the display reach the highest resolution, which can be called the highest resolution of this display.
Resolution is an important concept related to image, and it is a technical parameter to measure the expressive force of image details. But there are many kinds of discrimination, and their meanings are different. It is a crucial step to correctly understand the specific meaning of discrimination in various situations and clarify the relationship between different representations.
Some users often confuse resolution with point distance. Actually, they are two completely different concepts. Resolution refers to the distance between pixels. The more pixels, the higher the resolution. So the resolution is usually measured by the number of pixels, such as 640×480, and the number of pixels is 307,200.
Note: 640 is the number of horizontal pixels and 480 is the number of vertical pixels.
Because in the graphic environment, high resolution can effectively reduce the screen image, therefore, in the case of the same screen size, its resolution cannot exceed its maximum reasonable limit, otherwise, it will lose its meaning.
Maximum resolution of display size
14 inch 1024×768
15 inch 1280× 1024
17 inch 1600× 1280
2 1 inch 1600× 1280
Resolution analysis
High resolution is an important prerequisite to ensure the clarity of color display. The dot pitch of display is one of the foundations of high resolution, and the dot pitch of large-screen color display is generally 0.28, 0.26 and 0.25. On the other hand, high resolution refers to the maximum number of pixels that the display can achieve when displaying horizontally and vertically, which is generally 320×240, 640×480, 1024×768, 1280× 1024, etc. Good large-screen color display can generally reach 1600 ×. Higher resolution means not only higher definition, but also more content can be displayed in the same display area. For example, the resolution of 640×480 can only display one page, and the resolution of 1600× 1280 can display two pages simultaneously.
Resolution is a parameter used to measure the amount of data in bitmap images. Usually expressed as pixels per inch (ppi) and dots per inch (dpi). The more data it contains, the longer the graphic file and the richer the details. But larger files also need to consume more computer resources, more memory, more hard disk space and so on. On the other hand, if the image contains insufficient data (the graphic resolution is low), it will appear rather rough, especially when the image is enlarged to a larger size. Therefore, in the process of image creation, we must decide the correct resolution according to the final use of the image. The trick here is to ensure that the image contains enough data to meet the needs of the final output. At the same time, it should be moderate and occupy computer resources as little as possible.
"Resolution" is generally expressed by the number of pixels in all directions, such as 640X480. In some cases, it can also be expressed as "pixels per inch" (ppi) and the length and width of the graph. Such as 72ppi and 8X6 inches.
Ppi and dpi are often mixed. Technically, "pixel" (P) only exists in the field of computer display, and "dot" (D) only appears in the field of printing or printing. Please pay attention to the distinction.
Resolution is directly related to the pixels of the image, and we ......
What does pixel mean?
Pixel is the most basic unit of a picture or photograph. Enlarge a photo, for example, enlarge the photo with a picture viewing software such as "Magic Hand of Light and Shadow", and then enlarge it to a certain extent, and you will see that this photo is originally composed of countless unconnected "points" with different shades of color. These points are the pixels that make up this photo.
The denser the pixel distribution, the more subtle details of the object can be represented as arcs. So the higher the pixels of a photo, the finer the photo. The lower the pixel, the rougher the photo, and many details are difficult to show.
The image of a digital camera is generated by the camera's photosensitive device. Due to the size of the photosensitive device, when the size of the photosensitive device is fixed, pixels that are too high and too dense will cause "interference" between each other, which is not conducive to improving the clarity of the image. For home digital cameras, the size of photosensitive devices is limited. Some manufacturers often take pixels as gimmicks, trying to improve the quality of their products with high pixels. In fact, they didn't increase the size of the photosensitive device (which would increase the cost of the product! ), blindly increasing pixels is not good for improving image quality. Ordinary consumers must not be fooled by this kind of advertisement of merchants!
What is the concept of a camera pixel?
Pixel refers to the area of the smallest point on the display/mobile phone /DV/DC screen or sensor. Some DC have good quality and color control, and the color reproduction of each pixel on the imaging sensor is high. Even with the technology of 3cd superposition, the images are naturally clear, true and pleasing to the eye.
Just like Canon's image quality is obviously much better than Samsung's, Canon's 200 million photos are clear and expressive, and Samsung's 7 million bird camera photos are still ugly, which proves that pixels are not everything, but the key is technical skill. The key to determine the quality of a photo is the quality of CCD, especially the quality of lens, and the pixel value is only one of the factors. Some CCD areas. However, 7 million pixels is a bit overreaching, but the control technology has not been improved accordingly. Naturally, many pixels are randomly colored, and the imaging effect is not good. A good CCD is large enough, and the control technology is good, and the color of each pixel is more accurate.
Pixels are related to DPI. DPI is the resolution and refers to the dots per inch. DPI can be subdivided into horizontal resolution and vertical resolution, such as a picture of 1 inch * 1 inch. If its horizontal resolution is 100 dpi and its vertical resolution is 50 dpi, that is to say, it is divided into horizontal per inch 100 segments and vertical per inch 100 segments. Just like a grid on the meter scale, this picture has 100*50=5000 grids, and this picture has 5000 pixels. Because its horizontal resolution and vertical resolution are not equal, each pixel is a tiny rectangle.
So pixel is actually a concept of area, and because the pictures taken by computer/digital camera are equal in horizontal resolution and vertical resolution, each pixel is a tiny square, so "DPI represents the number of images per inch" is actually "dots per inch".
The area of each pixel is determined by the production process. The higher the technology, the smaller the area of each pixel, and more pixels can be accommodated on the screen per square inch. The higher the dpi value, the finer the image, and the pixels are too small for human eyes to distinguish, and the image looks the same as the actual one. For CCD imaging sensors such as DC/DV, besides many pixels, the area should not be too small, otherwise the image quality will be difficult to improve.
This is how the concept of digital camera "how many tens of thousands of pixels" came from. For example, a camera can take a picture with a maximum of 1600 pixels * 1200 pixels, and its pixel value is1600 *1200 =19.2 million, which is about 2 million.
What are the concepts of pixel and resolution?
1. What is a pixel?
Simply put, what we usually call pixels is the number of photoelectric sensors on CCD/CMOS. The photosensitive element forms a point on the output photo after photosensitive, photoelectric signal conversion, A/D conversion and other steps. If you enlarge the image several times, you will find that these continuous tones are actually composed of many small squares with similar colors, and these small squares are the smallest unit "pixels" that constitute the image.
Pixels are divided into CCD pixels and effective pixels. Most digital cameras on the market now label CCD pixels instead of effective pixels.
2. What is resolution?
When it comes to pixels, you have to talk about resolution. Because the two are inseparable!
The so-called "resolution" refers to the number of pixels represented or captured in a unit length. Like pixels, there are many kinds of resolutions.
One of the most common is image resolution. We usually say that the maximum resolution of digital camera output photos refers to the image resolution, and the unit is ppi (pixels per inch).
Printing resolution is also a very common one, as the name implies, it is the output resolution of a printer or developing device, and the unit is dpi (dots per inch).
The display resolution is the size of the Windows desktop. Common settings are 640x480, 800x600,1024x768, etc. Screen font resolution: the font resolution of PC is 96dpi, and that of Mac is 72dpi.
Of course, there will be resolutions of other output devices. Because of the variety, I won't go into details here. Interested friends can search online by themselves.
3. Relationship between image resolution and pixels
Having finished the definition of pixel and resolution, let's look at the relationship between them. Careful friends may have found that pixels are directly proportional to resolution, and the larger the pixels, the higher the resolution. Give an example!
As mentioned earlier, pixels are divided into effective pixels and CCD pixels.
Generally speaking, for a 2-megapixel digital camera, the maximum image resolution is1600×1200 =1920,000 pixels, that is, the actual effective pixel is1920,000 pixels.
Generally speaking, the maximum image resolution of a 3-megapixel digital camera is 2048×1536 = 3145728 pixels, which means that the effective pixel is 3 140000.
Other pixel-level digital cameras have the same resolution and effective pixel conversion.
It can be seen that the higher the pixel, the higher the resolution of the maximum output image.
4. Relationship between printing resolution and pixels
The printing resolution is related to the size we print, so it is more important.
In fact, the calculation method is also very simple:
2 megapixel digital camera, effective pixel 1.92 million, maximum output 1.600× 1.200 photos.
Width: 1600 pixels /300 dpi=5.3 inches
Height: 1200 pixels /300 dpi=4 inches
That is to say, if you print at an output resolution of 300dpi, you can print a photo of 5.3×4 inches at most. The usual photo size is:
5 inches: 5×3.5 inches
6 inches: 6×4 inches
Obviously, 2 million pixels can print 5-inch photos at 300dpi.
(Note: The maximum resolution that human eyes can distinguish is 300dpi. Beyond this resolution, the human eye can't see the difference, that is to say, there is no difference between 300dpi and 600dpi, so the maximum design output resolution of printing equipment at present is 300dpi. Of course, everyone has different requirements for clarity. Generally speaking, 200dpi can satisfy most people, so 2 million pixels are used for printing. )
Summary: As mentioned above, "print size" has a great relationship with image resolution. As long as the image resolution changes, the print size will change accordingly, and pixels are directly related to the image resolution, so the three can be converted to each other. And the most fundamental one is the pixel.
Therefore, when buying a digital camera, pixels are still an important consideration. How many pixels are needed can be determined according to your own needs. ...
What does pixel mean?
Pixel is a special word in the digital age, because digital things can't express colors continuously, and they can only be expressed by dividing the whole image into tiny points and then putting them together.
These dots are called pixels.
It is reported that according to the principle of camera and experiments on human eyes, the whole area of human eyes has about 570 million pixels.
But the human eye is binocular vision, and the accuracy of the center is poor on both sides. In short, it is not appropriate to use pixels to represent the resolution of human eyes.
What does the pixel grid mean?
Pixel format pixel colors are arranged according to the size and arrangement of components. This format is specified by the total number of bits used by each pixel and the number of bits used to store the red, green, blue and alpha components of the pixel color.
Pixel format describes the format for pixel data storage. Defines the encoding mode of pixels in memory. The following pixel format (PF_*) types are defined:
Local formats (PF_A8R8G8B8 and many other different types)
This means that locally stored plastic data (big or small, including 16, 24, 32 bits) is used in memory. At the same time, it also means that the picture in PF_A8R8G8B8 format can be regarded as a 32-bit plastic array, which is expressed as 0xAARRGGBB by 16. The meanings of these letters will be provided later.
Byte format (PF_BYTE_*)
In this format, each channel corresponds to one byte, and the channels are organized in memory in the same way as the format names are defined. For example, a pixel in PF_BYTE_RGBA format contains four bytes, one for red, one for green, one for blue and one for alpha channel.
Short format (PF_SHORT_*)
In this format, each channel corresponds to an unsigned short data (16-bit integer), and the channels are organized in memory in the same way as the format names are defined. For example, a pixel in PF_BYTE_RGBA format contains four unsigned short data, one for red, one for green, one for blue and one for alpha channel.
Floating point 16 format (PF_FLOAT 16_*)
In this format, each channel corresponds to a floating-point number of 16 bits, and the channels are organized in memory in the same way as the format name. For example, a pixel in PF_BYTE_RGBA format contains four 16 bits of floating-point data, one for red, one for green, one for blue and one for alpha channel. 16-bit floating-point number is also called semi-floating-point, which is very similar to the IEEE standard 32-bit single-precision floating-point number, except that it has only 5 exponent bits and 10 mantissa bits. It is worth noting that this is not a standard C++ data, and the CPU does not support it well enough, but GPU can handle it as efficiently as 32-bit floating-point numbers.
Float32 format (PF_FLOAT32_*)
In this format, each channel corresponds to a 32-bit floating-point number, and the channel is organized in the same way as the format name. For example, a pixel in PF_BYTE_RGBA format contains four 32-bit floating-point data, one for red, one for green, one for blue and one for alpha channel. In C++, this data is an ordinary floating-point number. Just "float".
Compressed format (PF_DXT[ 1-5])
S3TC compressed texture format.
In photoshop, what does "pixel size" mean in image-image size?
Pixel is the size of the picture, which is related to the resolution of the screen. For example, the resolution of 1024×768 means that the screen can display an area with a width of 1024 pixels and a height of 768 pixels. The pixel size m refers to the number of millions (m) pixels in the picture area, which is the unit of area. This picture occupies 2.38 GB in the computer storage device, which refers to the storage file amount of the picture file. The two are not the same concept.
What do pixel x size and pixel y size mean?
Is length and width. X represents the horizontal length and y represents the vertical length, which is the same as the coordinates.
What does it mean to have 5 million pixels in a photo?
Yes, it's usually a 4: 3 photo frame, with a length of 2560 pixels and a width of 1920 pixels.
What does px in ps mean? Pixels, or what?
The abbreviation of English pixel.