I have to make a 6m print from my 3000x2000 pixel image with minimum viewing distance of 1.5m. From the recommended 200dpi for large prints, It'll mean I need 47000pixels on the longest edge?
I've read from the net that it is recommended that the max interpolation is only up to 4 times the original picture. From my above calculation, I'll be upsizing the length by ~16 times?
The question is, do we need to upsize our pictures when we send to the printers or will they do the necessary based on my 6MP picture?