If I open up the Photoshop folder, I can see different Photoshop sources that are used inside this project. Here I will click on twine_cropped.psd. In the top of the Project pane, I can see a small thumbnail view of what this image looks like. Additionally, I can see the name of the Photoshop document here; there is small arrow and an indication that this Photoshop source is used four times throughout this project. The small arrow can be clicked, revealing each one of those four places where this is used. Clicking again closes up that window.

Below it, I can see the size and pixel aspect ratio of this Photoshop document. Down below there is an indication that its color depth is millions of colors, plus, meaning plus an Alpha Channel. The Alpha Channel is now interpreted as a Straight Alpha.

If I move down and choose AB Snowflakes.mov, instead of seeing the information for the still, I see information for the movie. Here I can see that it is 360x243 pixels, square pixel ratio. Its 6 seconds in duration and running at 30 frames per second. Its million of colors, but without the plus, which indicates there is no Alpha Channel on this movie.

Last is Photo - JPEG, the compression codec used to create this movie. At the top, I see it's called AB Snowflakes.mov, clicking on the small arrow will reveal that its not used.

Similarly, if we take a look at our Music, we can take a look here by clicking on either one of these aifs and seeing that the thumbnail at the top does not display video. 0x0 pixels means there is no video to display, instead we have got 7 seconds of audio.

You have a small icon here for a waveform and we see that the audio has been recorded at 48 kilohertz, 16 bit, and Stereo pair.

New to the After Effects CS3 is the ability to rename our source. We will click on the source, AB Snowflakes.mov. With that clicked, we will use the Return key on the keyboard to open up the dialog box to rename the source. It's important to note that this can be very confusing as a beginner, but you may get a file that has a rename source in it. We will call this digital snowflake, and use Enter on the number pad to accept it.

In the source column it's called digital snowflake.mov, but if we look at the file path, we will see that it's actually coming from a source called AB Snowflakes.mov.