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Date: Fri, 20 Jul 2012 14:33:19 -0700
Message-ID: <CANAMOe7Pe89-GvA1HFwcHamghGtEoR4FTodmfXuT26jG0WCAdg@mail.gmail.com>
Subject: Re: [AE] Photoshop CS6 Issues
From: Rick Gerard <rgeffects@gmail.com>
To: After Effects Mail List <AE-List@media-motion.tv>
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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 =F7 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)