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PPI has nothing to do with the number of pixels in an image or the resolution. PPI determines the print size. For example, open both of these in Photoshop: Now open them in Word. You won’t be able to see the 9999ppi image in word because it will be the about the size of a dot, but the 1ppi image will fill the page, because word lays things out so they can be printed. There are no inches in Video. If you turn resampling off and change the PPI in Photoshop the number of pixels will not change. Turn resampling on and change a 300 ppi image into a 72ppi image and the number of pixels will go way down so your 300PPI images that is smaller than 1920 X 1080 will now be much smaller. If it was 3000 pixels wide it would now be 720 pixels wide because when you resample an image and change the PPI the number of pixels change but the printed width stays the same. Just make sure that you have the height and width linked. If you goal is to resize the images so they are at least 1920 X 1080 then do that by resampling the image Alt/Option + Ctrl/Cmnd + i, then turn resample on and set the dimensions to pixels and enter 1920 or 1080 in the smallest box. You don’t need to worry about the PPI unless you plan to print the image. Rick Gerard DP/VFX Supervisor Northern CA |
