Use photoshop to do the problem of easy pull-ups

Your size is 10 times smaller, that your resolution should be increased by 10 times when you do it, according to the requirements of the spray painting 100dpi, then you have to 8 * 20cm set the resolution of 1000, so that there is no problem with the spray painting. Even according to the upstairs said 70dpi then you have to set to 700 to meet the requirements, but I think the easy to pull the treasure is basically still close to see, so to set to 1000 - 1200 is appropriate.