What are pixels and resolution?

What's the difference between pixels 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 (pixel per inch) printing resolution, which 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 the dpi (dots per inch) display resolution, which 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. The relationship between image resolution and pixels After the definition of pixels and resolution is finished, let's take a 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. The relationship between printing resolution and pixels. Printing resolution is related to the size we print, so it is more important. In fact, the calculation method is also very simple: for a 2 megapixel digital camera, the effective pixel is 1.92 million, and the maximum output is 1600× 1200. The width of the photo is 1600 pixels /300dpi=5.3 "and the height is 1200 pixels /300dpi=4". In other words, if you print with 300 dpi output resolution, you can print at most 5.3× 300 dpi. (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. If you want to get a large resolution, you must communicate with wedding photography and let them shoot with the highest resolution and reach the maximum pixel. If a 500-watt camera does not use maximum accuracy, ......

What is the relationship between the pixels of a photo and the resolution?

The maximum resolution of pixels is 200dpi and the maximum size is 300dpi.

300,000 640×480

500,000 800×600

800,065,438+0024× 768 5-inch two

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.

What do resolution and pixel mean respectively?

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. A 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 ......

Do pixels and resolution mean the same thing?

A digital image consists of several pixels. The higher the pixels per inch per unit area, the greater the resolution.

For example, digital pictures and puzzles have the same principle. A puzzle is made up of small pieces, each piece can be regarded as a pixel, and the resolution is how many pieces are used for the length and width of the puzzle.

What is resolution? What's the difference between pixel and pixel? Please say it briefly

Resolution refers to the number of pixels per unit length, and its unit is usually pixels per inch (ppi). 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, the highest resolution that a display can achieve is the highest resolution of this display only when the refresh frequency is "flicker-free refresh frequency".

Definition of pixel: pixel refers to the basic coding of gray level of basic original pigment Dan. It consists of the letters of the words Picture and Element, and is the unit used to calculate digital images. Just like 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 "pixels" that make up the image. This smallest graphic unit can usually display a coloring point on the screen. The higher the pixel, the richer the sample and the more realistic the color is.

What is the relationship between pixels and resolution of digital cameras?

First, the concept of pixel is defined.

For a photo, it is every point that makes up the photo. The more points there are, the more details there are in this picture.

For the display, it is a point when the picture is displayed. With the same display size, the more points, the clearer the screen looks.

Answer your questions one by one.

1 and high pixels can make up for many problems.

A, the definition of high-pixel photos is improved after restoration. Because many points will serve as one point. The advantage of improving sharpness is that it can reduce the focus ambiguity caused by jitter or defocus.

B, high pixel photos, after shrinking, will reduce noise. It turns out that the noise of large particles will shrink as the photo shrinks.

C, keep more picture details. Of course, imagine that if you change the monitor in the future and the resolution becomes tens of millions, will your current camera be insufficient?

In fact, high pixels have an advantage in photography. Of course, cameras are not made for computer desktops.

2. The manufacturing cost is very high, because the number of pixels needs to be increased by nearly ten times in the same size area. However, the latest mac book pro is made into retina screen, with 565,438+megapixels and 2880 x 1800 resolution.

3, this is related to the product manufacturing process, not the larger the screen, the greater the resolution, but the higher the pixel per unit area, the clearer the visual effect. Just like the latest mac book pro is only 15 inch, which is much smaller than TV.

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 relationship between picture quality and pixels?

High-quality photos must be based on high pixels, but high pixels do not mean high quality.

Whether the low number of pixels is available or not has any influence on the "image quality" is completely a "relative" problem. In other words, different situations will have different conclusions, so there is no right or wrong. It is impossible to draw a definite conclusion only by discussing this sentence itself and enumerating examples that are beneficial to the other party. It is typical to say each sentence.

Even so, it is necessary to analyze the reasons behind this "relative" problem, so that it is easier to understand those confusing arguments. For the sake of clarity, the simple definition of "image quality" is to restore the truth of the scene. Meanwhile, by comparison, unless otherwise specified, it is assumed that the total area of photosensitive chips is the same.

The first "relative" factor depends on the complexity of the subject (information) and the need for shooting or appreciation.

In principle, a large number of pixels can get a lot of information. Because the photosensitive chip of Bayer structure (mosaic) needs to rely on adjacent pixels to calculate the color, the color reproduction degree will also be improved, but whether this will affect the "image quality" is not a fixed answer.

In some cases, low pixels are certainly possible. For an extreme example, if you take a piece of pure white, flat and pure white paper, one pixel is enough. In this case, any number of pixels or pixels per inch will not affect the final output result. No matter what output you use and what size you output, it is absolutely correct that the number of pixels does not affect the "image quality". On the other hand, at the other extreme, if you shoot high-density lines on the Gao Fancha standard, the results of different pixels will be completely different. At this time, it is absolutely wrong that the number of pixels does not affect the "image quality".

The actual shooting scene is between the two extremes, and the information content of shooting highlight model is completely different from that of large-scale scenery. At the same time, due to the lens, permeability, composition, shooting methods and parameters, aesthetic orientation, personal likes and dislikes and other subjective and objective factors. The influence and demand for information are also different. Some people like every hair and pockmarked face of the model to be clear, some people like an egg face, some people want every branch in the distance to be clear, some people pursue the hazy feeling of freehand brushwork in ink, and some people even shoot moving objects with a slow shutter. In this case, we can imagine what would happen if we only caught the elephant we touched.

The second factor depends on the progress of output technology, which is a question of "relative" time.

Take the monitor as an extreme example. N years ago, when the resolution was only 640×480, the photos taken by the camera with 654.38+0 million pixels and the camera with 654.38+0 million pixels were displayed in full screen. There may be little difference (see next point), but it will be 1920× 1088. In the future, there will be a display screen with/kloc-0.0 million pixels (I calculated in a post a few days ago, and now the screen used by iPhone4 is almost/kloc-0.0 million pixels, of course, there will be no such product soon). Will it make no difference? If you listen to other people's propaganda when you buy a camera, it is said that the monitor has only 300,000 pixels anyway, and a camera with 654.38+00,000 pixels is enough. N years later, the 6.5438+0 million pixel monitor comes out, and all your photos are unsightly. Will you regret it?

The same is true for printing or printing. Now the so-called 300DPI standard is only the product of existing printing technology. N years ago, in the era of manual mimeograph, maybe 30DPI was enough to print posters. Later, more sophisticated ink and printing equipment came out, and maybe 600DPI was not enough. Will you regret it then? I regret that I can't remake it. (PS: This statement does not apply to artists who pursue the artistic conception of ink painting. Please don't sit in the right position. )

The third factor is the difference between scene and image processing algorithm, which is also a "relative" problem.

If both low-pixel and high-pixel pictures are reduced and output as fixed-pixel pictures, there may be little difference in some scenes and some algorithms, but there may be great difference in some scenes and some algorithms.

It will be clearer to give an example. For example, in the same scene, there is a photo of100000 pixels and a photo of 20 million pixels, which is better? The answer is-not necessarily. Suppose you use the simplest thumbnail algorithm, with every two pixels of100000 as the first and every four pixels of 20 million as the first. The result of100000 pixels may be better, but if you ask professionals to design an algorithm thumbnail for your picture. ......

Relationship between ps pixel and resolution

Pixel size refers to how many pixels a picture has; For example, 800px× 100px, which means it is 800 pixels wide, 100 pixels high, and * * * has 80,000 pixels. Document size refers to the actual output size of the picture; No matter how big it is displayed on the computer, the printed size will be the same as the document size. Resolution is the quotient of pixel size and document size, pixel size ÷ document size = resolution. Another thing that is easy to confuse is that when creating a new file, you can choose pixels as the unit and centimeters as the unit. Therefore, it is easy to cause a misunderstanding that pixels, like centimeters, are all units of length, which is a misunderstanding. Using pixels is to set the pixel size. After setting the pixel size and resolution, the software can automatically get the document size according to the equation. For the same reason, centimeters are used to set the document size. There is also a misunderstanding, which is to confuse various resolutions. Resolution has different definitions in different fields, and of course it has different functions. The above is the meaning of resolution in PS. In PS, we should consider the document size and pixel size, because this determines the quality of our drawing and output printing. In life, we often encounter some resolution problems, such as display resolution, which refers to how many pixels there are on a display panel. There is also the resolution of the camera, also called optical resolution or physical resolution and so on. So it depends on the real meaning of the resolution and on what occasion it is used. With the development of the Internet, more and more people surf the Internet and have more and more views on some things. In particular, some confusing concepts, such as video, chat to see each other called video, online video is also called video, and even many people call the camera video. In addition, there is the concept of memory. Memory sticks, mobile phone memory cards and even USB flash drives are all called memory. There are many such words, and resolution is one of them.

What is the relationship between resolution and pixels?

Pixel refers to the number of points in the photo (indicating how many points the photo consists of), and resolution refers to the pixels per inch in the photo (indicating dots per inch-dpi). The actual size of the photo is determined by the pixels. A photo with large pixels, if the resolution is set to be large, the printed photo may be small (but clear). On the other hand, if the resolution of small pixel photos is set, the printed photos may be large (but not clear).

Resolution refers to the pixel value per unit length, which is related to the printing quality. The commonly used dimension is PPI total pixel, which refers to the sampling accuracy of the picture and is related to the printable size. Usually expressed in the form of "length × width", the product is the so-called total pixel. Because the aspect ratio of the picture is different, the same total pixel can have multiple specifications.