What does it mean to save in jpg format with an accuracy of not less than 300dpi and a size of 70cmx 100cm?

There is no contradiction. It is difficult to set the picture in this format with gadgets on the network, but it can be very simple to use PS. The specific setting method is as follows:

Materials required: PS CS6 example.

First, double-click with the left mouse button to open Photoshop software.

Second, click the File option on the toolbar.

3. Click the "New" option in the pop-up drop-down menu.

4. Click the arrow behind the width to open the scale list, and then click "cm".

5. Enter 70 as the width and 100 as the height respectively.

6. Then set the resolution to above 300 (300 is the standard print DPI), and click OK.

7. Then open the folder where the required picture is located and drag it to the PS canvas.

8. Finally, press Ctrl+Shift+S to open the Save As window, set it to JPG format, and click Save.