How many pixels is 3M times? I wonder what is the perfect pixel of a photo sent to space?

3M is 3 million pixels. "M" is the abbreviation of "Megapixel", which means "Megapixel".

As for the most perfect pixel transmitted to space, there are actually different standards according to different uses.

For example, a photographer takes a big landscape. His purpose is to tell others that his light consumption is exquisite and his composition is good, so he wants the viewer to see the layout of the whole picture without zooming in. So in fact, the pixel does not need to be too large, and it can be reduced to 1M or even 0.3M If it is too large, the reading time will be delayed.

For another example, a photographer took a picture of a school class, so he wanted visitors to find a clear head from it. At this time, he will try to keep the size of the picture as large as possible and upload it with the largest size allowed by space. Because the smaller the compression, the more serious the details are missing.

So it varies from person to person.