What is a pixel? What is the height of the pixel?

Pixel: the smallest unit of an image, which can usually display a color point on the screen.

Pixel is the most important index to measure a digital camera. Pixel refers to the resolution of a digital camera. Depending on the number of photosensitive elements on the photoelectric sensor in the phase machine, one photosensitive element corresponds to one pixel. Therefore, the larger the pixel, the more photosensitive elements, and the greater the corresponding cost.

The image quality of a digital camera is determined by pixels. The larger the pixel, the greater the resolution of the photo, and the larger the print size without reducing the print quality. Early digital cameras were all below 6.5438+0 million pixels. Since the second half of 1999, 2-megapixel products have gradually become the mainstream of the market. At present, the development trend of digital cameras, pixels are like the main frequency of a PC's CPU, and there is an increasing momentum.

In fact, from the perspective of market classification, for popular products, considering the factor of cost performance, the bigger the pixel, the better. After all, a 2-megapixel product can meet most applications of ordinary consumers. For this reason, while most manufacturers pursue high-end digital cameras with high pixels, the largest output at present is still the popular mega-pixel products. Professional digital cameras have products with more than 1 100 million pixels. With the progress of CCD (imaging chip) manufacturing technology and the further reduction of cost, 3 million pixel products will soon become the mainstream of the consumer market.

In addition, it is worth consumers' attention that the current digital camera products are nominally divided into CCD pixels and software-optimized pixels, and the latter is much higher than the former. For example, a brand of Volkswagen digital camera has 2.3 million CCD pixels, while the pixels after software optimization can reach 3.3 million.

"pixel painting"

Pixels are actually made up of many points.

The "pixel painting" we are talking about here is not a dot matrix image corresponding to a vector diagram, but an icon-style image. This style of image emphasizes clear outline and bright color, and the shape of pixel map is often cartoon, so it is loved by many friends.

The method of making pixel map hardly uses aliasing to draw smooth lines, so it is often used. Gif format, and pictures often appear in dynamic form. However, due to its special production process, it is difficult to guarantee the style if the size of the picture is changed at will.

Pixel painting is widely used, from the picture of FC home red and white machine played as a child to GBA handheld machine today; From black and white mobile phone pictures to today's full-color handheld computers; Even the computer we face every day is full of pixel icons of various software. Nowadays, pixel painting has become an art, which deeply shocks you and me.