What is the minimum size of landscape photography?

1, you want to reduce it, mainly depending on the format (size) of the pictures you publish in the future. You can calculate by 300DPI (300DPI means 300 pixels/inch, 1 inch =25.4 mm). When you publish 4000*3000 pixels, you can think of 13.3* 10 inch (about 340*250 mm).

I advise you not to do it as much as possible, because you can't enlarge it if you shrink it. Besides, how much space can you save? It's really not good to carve a mobile hard disk on a CD.