How big is the maximum capacity (pixels) of a photo you have ever seen?

70 billion pixels.

It was taken by a foreign photographer. The photo capacity is 200GB and the pixels reach 70 billion pixels. The shooting lasted two days and was shot with two Sony A900s and then combined into a photo (24.8 million pixel SLR).

Pixel introduction:

Pixels are composed of small squares in the image. These small squares have a clear position and assigned color value. The color of the small square and The position determines how the image appears.

You can think of pixels as indivisible units or elements in the entire image. Indivisible means that it cannot be cut into smaller units or elements. It exists as a small grid of a single color. Each bitmap image contains a certain number of pixels, which determine the size of the image on the screen.