DPI/PPI is irrelevant in v

DPI/PPI is irrelevant in video – It is used only in print work. Video is based on pixels only, no per inch. Images for video should be sized using 72 DPI – 72 DPI and 400 X 300 is the same as 144 DPI and 200 X 150 – both equate to 28800 X 21600. NTSC SD is 720 X 480 and HD is 1920 X 1080 or 1280 X 720.