When taking pictures, what resolution setting is appropriate?

7-inch photos are 2 million to 3 million pixels, 10-inch photos are 3 million to 5 million pixels, 20-inch photos are 5 million to 8 million pixels, and photos over 50 inches are 10 million pixels.

When choosing a digital camera, you must first know what you are doing with the photos you have taken-whether you want to share them with netizens online or print them out and put them in an album for yourself, relatives and friends to read from time to time; Perhaps more photographers want to take part in photography competitions, publish their own works and be able to exhibit and show them in the future. So we might as well consider the characteristics of these uses and choose a digital camera with the right number of pixels.

For web browsing:

At present, the minimum display (length× width) of computer screen is 800×600 pixels (480,000 pixels), and the maximum is 1 600×1200 (2 million pixels), while the picture size only used for screen display is smaller than the screen size, so the pixel size of digital camera suitable for this purpose is required to be1.

Photo album printing and exhibition:

This kind of pictures are generally for commercial purposes and need to meet the requirements of customers. For example, an exhibition in the "Popular Photography" gallery requires pictures to be enlarged to 16 inch, and a 5-megapixel digital camera just meets this requirement. If it is used for such purposes, we should carefully choose high-end digital cameras.

Browse photo albums:

The photos inserted into the album are generally 5-7 inches, which requires a moderate amount of digital image data; A digital camera with 2-3 million pixels will do. This kind of digital camera has many styles, moderate price and wide choice in the market. But choosing digital cameras produced by professional camera manufacturers can ensure better picture quality.

Submit publications and participate in photo competitions:

The number of pictures participating in the photo contest should be 8- 10 inch, and the amount of digital image data should be large enough to reflect the quality of the output pictures; Quasi-professional digital cameras with 3 million to 5 million pixels produced by professional camera manufacturers can meet this purpose. It can also meet the submission requirements of general newspapers and magazines.

What are the pixels of a digital camera?

Refers to the resolution of a digital camera. It is determined by the number of photosensitive elements on photoelectric sensors (CCD, SCCD, CMOS) in the camera. Generally speaking, one photosensitive element corresponds to one pixel. Therefore, the greater the number of pixels in a digital camera, the more photosensitive elements there are, the greater the corresponding cost and the more expensive the digital camera is.

What are the pixels of a digital image?

Nowadays, more and more pictures are stored and transmitted in digital form, such as being recorded on the memory card of a digital camera and burned on a CD; At the same time, photos and negatives can also be converted into digital images by scanning and electrical separation.

For digital images (or image electronic files), pixels are the most basic units of images. Just like we collage a picture with a mosaic, a mosaic is a pixel.

The pixels of a digital camera correspond to the pixels of a digital image. We can find the corresponding relationship between them in the table on the next page.