| ||||||||||
| Jim Curtis wrote: ".... In Ae, the 72 number is understood, as it's the screen resolution built into Ae. You can test this by exporting any NTSC frame and bringing it into Ps. Look at the Image Size in Ps, and you're going to see three numbers: Height, Width and Resolution (which is 72)." That's almost right, well no it's not right at all. 72 is what you get when you open up an untagged image in most photo editors including Fireworks and Photoshop. An untagged image is for example a .gif. There's no place in the gif format to give a number for dpi. Open one in Photoshop and it will tell you that it's 72 DPI. Change the dpi to 300, save the image, and open it again and it will still be reported as 72 dpi. The screen resolution of AE is the dot pitch of your display. If you're pumping AE through a DVI adaptor to a projector and viewing on a 30foot screen (don't laugh I did a bunch of times presenting at NAB) then the screen resolution is 20 feet divided by the resolution in pixels of the projector. That's somewhere around 8 pixels per inch (1920 ÷ 240). If you're using AE on a new MacBookPro with then you've got a whole different story with a screen resolution of about 220 pixels per inch. That means you can see a full hd picture with room to spare on a 15 inch laptop. It's important to remember that there are no inches in video, digitized video, or any image displayed on a web browser. High resolution does not mean high DPI it means a lot of data, a lot of pixels. As much as we would like to think HD video is Hi Resolution, it's pretty anemic when compared to just about any point and shoot camera on the market. Even my phone takes higher resolution (more pixels) photos than HD video by about a factor of 4 (3264 X 2448 vs 1920 X 1080) |
