The size of the JPG picture displayed on the mouse is 30K, which is different from that of the picture opened by PS, and it is 707K. How to understand it?

The size displayed on the mouse is 30K, which is the size actually stored in the disk, and it is the same size when copied to the USB flash drive.

The large 707K displayed after opening with PS is the actual memory space occupied by the picture, but it will be saved as 30K, because it is saved in JPG and compressed format.

Now memory cards are generally 2G-32G.

1G= 1024M, 1M= 1024KB (which is what you said), so even if it is not compressed, 1G memory card can store 1400 (approximately) 700.

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