How to take clear digital photos? Thank you, everyone.

First, using a high-pixel digital camera If you want to take high-definition photos, it is very important to choose a high-pixel digital camera, but the higher the pixel, the better, depending on the purpose of the photo. It takes 400,000 to 800,000 pixels to post or send emails online; 5×7 inch printing, 265,438+million pixels is enough; If you zoom in to more than 8× 10 inch, you need a digital camera with 365438+ megapixels. The larger the size to be enlarged, the higher the pixel value of digital camera is required. However, it should be noted that in digital cameras with the same pixel value, the larger the image sensor area, the better the imaging quality and the clearer the photos taken. Second, the use of high-resolution mode, there is no doubt that when shooting with a digital camera, we must first pay attention to the resolution setting. Of course, the higher the resolution, the better the image will be. However, there is no need to set the resolution too high, and it depends on the needs. If the resolution is too high, the image file will have a large amount of data, which will not only occupy a lot of storage space, but also slow down the speed of reading, storing, transmitting and processing, and waste time. Resolution is the choice of total pixel value when shooting, and the English word is resolution. The resolution of general digital cameras is divided into high, medium and low grades. Let's take Nikon D 100 as an example. Nikon D 100 is a 6 megapixel digital camera. Its resolution can be divided into three types: large, medium and small. In English, they are big, medium and small, or L, M and S for short. The actual pixels of the three resolutions are: large: 3008×2000, and the actual pixels are 6 million; Medium: 2240× 1488, with 3.3 million actual pixels; Small: 1504× 1000, actual pixel10.5 million. The digital camera has already set the image resolution and compression mode when it leaves the factory. Nikon D 100 is set to be large when it leaves the factory, that is, 3008× 2000 = 6 million pixels. Generally, when enlarging photos below 8× 10 inch, use a small frame of 1504× 1000, and the actual pixel is 1.5 million; When enlarged to 8× 10 inch to 14×20 inch, the middle frame is 2240× 1488, and the actual pixel is 3.3 million. If you want to enlarge it to more than 20×24 inches, you need a large frame of 3008×2000, and the actual pixel is 6 million. Third, the use of low compression ratio format in digital cameras is related to the setting of image quality, including "resolution" and "image quality". Just now, we talked about "resolution". Let's look at "image quality". The English words of Image Quality are image quality, also known as "file format" and "compressed format". The image quality of different digital cameras has different formats. The compression format of digital cameras has also been set at the factory. In order to save space, the default setting of compression format for digital cameras is generally low. Let's take Nikon D 100 as an example. Its image quality is divided into NEF, TIFF, Fine, Ordinary and Basic. Different compression ratios can be selected according to different needs. NEF is the original file format, which is the RAW format. Generally speaking, there is no need to choose this file format, unless you are taking very demanding group photos or making beautiful albums. If you are participating in a photo competition organized by the military or local organizations, you can choose TIFF format. TIFF is a lossless compressed RGB format, which has no influence on the photo quality. If you want to enlarge your photos and put them in the office or hang them at home, you can choose a fine format. FINE is a JPEG format with low compression ratio, and the loss of image is almost invisible to the naked eye. If you are not particularly concerned about the data volume of the file, it is recommended not to choose normal format and basic format. Because NORMAL is a JPEG format with medium compression ratio and BASIC is a JPEG format with high compression ratio, they not only lose the color and level of the image, but also lose a lot of clarity. The same format is Large's 3008×2000 format, and the definition of photos in ordinary and basic formats is much worse than that in TIFF and fine formats. We can choose different image sizes and image quality according to our actual needs and the capacity of the memory card. 4. Setting the sensitivity of a low-sensitivity digital camera can be adjusted. However, it improves the sensitivity and sacrifices the image quality. Because the sensitivity of digital camera is improved by the gain of amplification circuit, the signal is amplified and the noise is also amplified. If the sensitivity of digital camera is set higher, the photos taken will have gray contrast and coarse particles, and the tonal details of still life cannot be displayed normally. Therefore, when shooting with a digital camera, instead of setting a high sensitivity, it is better to use a large aperture and use the lowest sensitivity as much as possible, so that the photos taken are not only saturated in color, sharp in contrast, but also delicate in tone and extremely high in definition. Five, using manual exposure mode plus flash photography Digital cameras generally have exposure modes such as aperture priority, shutter priority, program and manual control. When choosing the aperture priority mode, use the best aperture as much as possible, because this can improve the resolution of the camera lens and thus improve the image quality. When choosing the shutter priority mode, try to use the short-time shutter, because the short-time shutter can improve the image clarity of moving objects. When shooting an object in dim light, try to open the aperture instead of extending the shutter time, because long exposure will make the image sensor produce noise and affect the image quality. Try not to use the program exposure mode, because the aperture and shutter are automatically selected by the digital camera anyway. At this time, the digital camera doesn't know whether you are shooting a still life or a moving object, and you don't know whether to use the best aperture or a short shutter. In fact, it is best to use manual exposure mode when using digital cameras. Because the manual exposure mode can artificially select the most suitable aperture and shutter, control the resolution, control the movement of moving objects and the depth of field of the image. When using manual exposure mode, if the brightness of the subject is not enough, an external flash can be added. In this way, not only a smaller aperture and shorter shutter time can be used, but also the light effect of the image is easier to control manually. Sixth, shoot with a visual viewfinder as much as possible. Hand jitter has a great influence on image clarity. Many photos are not clear enough because of hand jitter. In order to keep the hand holding the camera from shaking as much as possible, try to use a visual viewfinder instead of an LCD viewfinder when shooting. Because when shooting with LCD screen, the camera is far away from people, hands are open, and it is easy to shake. The correct way is to use the visual viewfinder, put the camera close to the eye socket, fix the camera with the brow bone and cheekbone, hold the ribs with your elbow, hold your breath and gently press the shutter. If possible, you can shoot with a tripod, which is conducive to improving the definition at any time. 7. Use high-quality lenses as much as possible. This problem is to choose a lens for a professional digital camera, while for an amateur digital camera, the lens factor should be considered when choosing a camera. There are not a few digital cameras that use high-quality lenses. For example, several high-end amateur digital cameras of Sony use German Carl Zeiss lenses. Panasonic's high-end amateur digital cameras all use German Leeds lenses, which is to improve the image quality. Eight, as far as possible to improve the clarity and saturation of the picture. At present, digital cameras have the adjustment of color saturation and image sharpness, which is also very important for the final definition of digital images. Because digital images can be more perfect through post-processing, the saturation and clarity of images can also be improved during post-production. But everything is measured, so we must grasp the "degree". If we blindly improve the sharpness and saturation and ignore the authenticity of the image itself, then too bright colors and too sharp edge effects are equally undesirable. We pursue high-quality images, and one standard of high quality is authenticity. Overexaggerated colors, contrast and sharpness are not good tendencies.