How many pixels does a digital camera take good pictures?

many consumers, because they don't know about digital cameras, unilaterally think that high pixels are good. Not really. When purchasing a digital camera, we should give consideration to its digital characteristics and optical characteristics.

1. The lens of a digital camera. A well-designed high-end camera lens is composed of multiple groups of lenses and contains aspherical lenses, which can significantly reduce color shift and minimize graphic distortion and distortion. The expensive fluorite or glass is used as the lens. In order to reduce the weight and cost, the lenses of household and semi-professional cameras are made of resin.

2. Image value of CCD of digital camera. CCD is the heart of digital camera, and it is also one of the main factors that affect the manufacturing cost of digital camera. Therefore, it has become an important standard for classifying digital cameras. At present, the entry-level products are 3-5 million pixels, while commercial and semi-professional users prefer products with more than 5-1 million pixels.

3. Zoom of digital camera. Optical zoom is a real zoom, which will not affect the imaging quality of photos; Digital zoom is electronic zoom, which is a local enlargement at the expense of photo clarity.

4. Battery and power consumption of digital camera. Digital cameras have LCD display and built-in flash, so the battery consumption is larger than that of traditional cameras. Using the No.5 battery is cheap and can be bought anytime and anywhere, but it won't take long for the battery to die. Therefore, it is best to choose a model equipped with rechargeable lithium batteries. At present, mainstream digital products have been designed as lithium batteries, and complete charging equipment is provided as accessories.

5. Additional functions. The more functions there are, the more fun and versatile it means to use digital cameras. For example, many digital cameras have video output function, which can be connected to TV to browse photos; Some can set their own startup pictures and shutter sounds like mobile phones; Some can have short-term digital video recording function. The installation of the driver of digital camera should be very simple, and it should be able to download pictures quickly and have photo previews. For example, the software function attached to Canon digital camera is perfect, which can classify and manage pictures, and the settings when printing are more varied, and pictures can also be simply modified.

The image sensor is the decisive factor of the camera performance. In general, the pixel value of the image sensor should be greater than the maximum pixel value of the real shot image. Some manufacturers use software interpolation to increase the pixel value of the image in order to make up for the pixel shortage of the image sensor. In fact, this interpolation method can be realized in almost all image processing software, so it is of little practical significance. The purchase must be based on the hardware pixel value of the image sensor rather than the maximum pixel value of the output image.

digital cameras record photographic information in a semiconductor element called CCD (Charge Coupled Device), not on the film of a silver salt camera. The CCD size, like the TV set, refers to the diagonal length, expressed in inches, such as "1.27 inches (note)". The larger the CCD, the more pixels and the higher the sensitivity. Therefore, with the same number of pixels, the larger the CCD, the better the image quality. CCD size 1/2.7 inch (4.mm×5.3mm)1/2 inch (4.8mm×6.4mm)1/1.8 inch (5.19mm×6.91mm)2/3 inch (6.6mm×8.8mm) Note: 1 inch is equal to 2.54cm, and the CCD of digital camera is adopted.