What do OPPO R9s mean by taking pictures of 3200w and 6400w?

The photographed pixels are 3200w and 6400W w.

Pixel refers to the basic primary color pigment and the basic coding of its gray level. Pixel is the basic unit of a digital image, and the resolution of the image is usually expressed in pixels per inch (PPI). For example, a resolution of 300x300PPI means that the number of pixels per inch is 300 both horizontally and vertically, or it can mean that there are 90,000 (300x300) pixels per square inch.

Like photographic photos, digital images have continuous shadows. If you enlarge the image several times, you will find that these continuous tones are actually composed of many small squares with similar colors, which are the smallest unit of the image-pixels. This smallest graphic unit usually displays a single coloring point on the screen. The higher the pixel, the richer the sample and the more realistic the color is.

Several other concepts, such as voxel, texture element and surface element, are all derived from the concept of pixel and used in other computer graphics and image processing applications. Dots are sometimes used to represent pixels, especially for computer marketers, and most of the time they are represented by DPI (dots per inch).