Change Dpi of a Picture in Photoshop
In this tutorial you will learn the steps to change dpi (dot per inch) by going through the image size. In Photoshop, it is called pixel per inch (pixel/inches). Follow these steps to get the desired output.
1.Insert an image, Go to file > open > select the image > ok.
2.Then, go to image > image size, (ALT+ CTRL+ I).
3.Hit the resolution into 300 then press ok.