Many mobile phone cameras say 1 10,000 or 300,000. What does this mean?

Category: electronic digital >> Other digital products

Analysis:

This is about pixels.

Effective number of pixels is called effective number of pixels in English. Different from the largest pixel, the effective pixel number refers to the pixel value that really participates in photosensitive imaging. The value of the highest pixel is the real pixel of the photosensitive device, and this data usually includes the non-imaging part of the photosensitive device, while the effective pixel is the value converted under the zoom magnification of the lens. Take Minolta's DiMAGE7 as an example, its CCD pixel is 5.24 million (5.24 megapixels). Because some CCDs do not participate in imaging, the effective pixel is only 4.9 million.

Digital pictures are generally stored in pixels, and each pixel is the smallest unit in digital pictures. The larger the pixel, the larger the area of the picture. To increase the area of a picture, if no more light enters the photosensitive device, the only way is to increase the area of pixels, which may affect the sharpness and clarity of the picture. Therefore, under the condition of constant pixel area, the digital camera can get the largest picture pixel, which is the effective pixel.

When users buy digital cameras, they usually see the merchants promoting "the maximum pixel reaches XXX" and "the effective pixel reaches XXX", so how should users choose? When choosing a digital camera, we should pay attention to the effective pixel number of the digital camera, and the value of the effective pixel number is the key to determine the picture quality.

Although digital camera has gradually become the first choice for photographers, its rapid development is only a few years. At the beginning of the birth of digital cameras, pixels are a brand-new thing for many people. Even now, many beginners don't understand this. In order to help those novices who have just set foot in the field of digital photography to better understand digital cameras and master digital photography, here is the difference between pixel and image resolution of digital cameras. It's not what we thought. The birth of a new thing often requires a process of familiarity and understanding. As long as you master the essentials, you will have a feeling of "suddenly looking back, but that person is in the dim light".

In order to better understand the basic principle of digital photography, we must have a certain understanding of the pixels and resolution of the image. Traditional film cameras store the captured images on film, while digital cameras store the captured images in the form of pixels in the memory or memory card of digital cameras. Pixel is the most basic element and unit of digital image. Thousands of pixels make up a vivid digital image.

Image resolution determines the detail and clarity of the image. The more pixels, the higher the resolution of the image. Because there are many pixels that make up a digital image, their units are generally millions, which is what we usually call millions of pixels. Digital cameras are mostly classified according to the pixel level of images that can be taken. At present, the resolution of digital cameras is mainly between1-5 million pixels, and 5 million pixel digital cameras are professional digital cameras with high resolution. 6 million pixel digital cameras have also begun to appear.

The images taken by digital cameras vary greatly in detail according to the resolution used, especially after the images are enlarged, the difference between low-resolution and high-resolution images is clear at a glance. What we use here is a flower image taken by a 365438+ megapixel digital camera in macro mode. First, set the resolution of the camera to the highest (365,438+megapixels). After shooting, we can see that the definition of the image is still very good.

But if the resolution is 6.5438+0.3 million pixels, the clarity and sharpness of the enlarged image will not be very good.

One advantage of high-resolution images is that the image quality will not be reduced after enlargement, while the quality of low-resolution images will be reduced to some extent whether they are enlarged or printed as photos. If you print a flower image with a resolution of 1.3 million pixels into a 5x7-inch photo, the effect is acceptable. If you print a photo with a resolution of 1 1x 14 inch, the quality is not flattering.

Which resolution is best for you?

With the increasing popularity of digital cameras, the price of digital cameras is also declining. Even a 5 megapixel digital camera is not surprising. 200 1 year is the world of 3 million pixel digital cameras. According to industry analysis, this year should be the heyday of 4 million pixel digital cameras. However, the prices of different levels of digital cameras are still very different. Of course, the price of a high-resolution digital camera is definitely much more expensive, so when buying a digital camera, you can decide which one to buy according to the image quality you need to shoot. If you just take pictures for email, or print the pictures as 5x7-inch photos, a digital camera with 654.38+0 million pixels can meet your needs well. If you want to print the captured image as an 8x 10 inch photo, you should choose a 2 megapixel digital camera. If you want to print the captured images as 1 1x 14 inch photos, I suggest you buy a digital camera with more than 3 million pixels. Of course, if you have money, you can consider a digital camera with more than 4 million pixels, which has a wider range of applications.

No matter how high-resolution digital camera is used to shoot, everyone can adjust the resolution of the shot image. For example, a digital camera with 365,438+10,000 pixels can shoot images with several resolutions of 365,438+10,000 pixels, 2.2 million pixels,1.6,000 pixels and 800,000 pixels. You can change the resolution of the captured image in the image quality mode menu of the digital camera. If you choose low-resolution shooting, the shot image may not have many details and the quality may not be very good, but it can save more storage space. On the contrary, high-resolution images have better details, but need to occupy more storage space. A memory card with a capacity of 48MB can only store five images at the highest resolution, but as many as 144 images at the lowest resolution.

In the actual shooting process, it is completely unnecessary for us to shoot images with the same resolution, but we can adjust them according to actual needs. If you only shoot images for e-mail, you can set the image resolution to 800,000 pixels, which can save a lot of storage space, and because the file of low-resolution images is smaller, it is more convenient to send. Finally, it should be emphasized that high-resolution images have more pixels and can be printed into large-size photos; Low-resolution images have fewer pixels, so they can only be printed as small-sized photos or sent as attachments to emails. Choosing a suitable digital camera according to your own needs and financial wealth will bring you endless fun. After all, the trend is the trend. If you want to stand on the wave of fashion, you have to spend a lot of money to chase the higher and higher pixels of digital cameras. Whether it's worth it depends entirely on you, at least you won't miss some wonderful moments that you are determined to win because the highest resolution of the digital camera is too low:)