What are the advantages of high pixel of SLR? What are the disadvantages of low pixels? How many pixels is better when choosing a camera?

High pixel can output a larger size without damaging the image quality, especially in advertising printing, which requires large-area inkjet printing, so it is necessary to have a high pixel original.

On the other hand, low pixels can't output too much, otherwise you can see pixels (magnification is a small square).

However, the more important factor affecting the quality of the camera is the size of the photosensitive element, which is also a camera with 1200W pixels. The quality of the card is completely different from that of the SLR. Therefore, when choosing a camera, we should first try to choose a large photosensitive element (CCD or CMOS), and then choose a high pixel and a good lens.