Editing Still Images

Editing Still Images

Okay, the question on the table is this: Your digital camera takes shots at a princely resolution of, say, 2160 x 1440 pixels. The maximum DVD video resolution is 720 x 480. How do you resolve the difference?

To answer this question, let's first get a bird's-eye view of how Studio works with still images and then explore the different ways you can crop your images so that you can present them most effectively in Studio.

How Studio works with images

Studio takes an admirably laissez-faire approach to images, basically displaying them as you place them in the movie. It doesn't try to fill the screen with your image, stretching it horizontally or vertically, or trim your image to fit; it simply makes your image larger or smaller to fit the screen without changing the aspect ratio. If this means that your image doesn't completely fill the 720 x 480-pixel DVD frame, so be it. At least there's no distortion.

Studio also provides excellent visual cues about what your image will look like when it's finally produced. Let's take a look at Figure 5.13 to get a sense of how this works.

Rosie 1 is the original 2160 x 1440-pixel image, shot by turning the camera to the side to capture Rosie's glam pose Rosie 2 is the same image rotated 90 degrees to the left.

If you click Rosie 2 to preview her in the Player, you see large areas of black to her left and right, which is precisely the way the image would appear in the final DVD or video ( Figure 5.14 ). This is Studio's way of telling you that the image doesn't match the final resolution of your project, and Studio is not going to squish or otherwise distort the video to make it appear full screen. Note that these same black areas show up on the Still Images tab of the Album, providing the same message.

Optimizing Rosie

The Rosie picture presents two opportunities. To go with the original impulse of the photographer, you can crop away the bottom of the image to get a bit closer while retaining the vertical, portrait look, as shown in Rosie 3 ( Figure 5.15 ). She's a bit more prominent in the screen, but you still have those black areas on the sides. The other alternative is the full-screen, fetching face shot. Here the image has been cropped so that Rosie fills the entire screen, making all involved thankful that she takes after her mother, not her father ( Figure 5.16 ).

The obvious question is, what image resolution must you use to totally fill the Player window and eliminate those black bars? Since picture resolutions vary immensely among different cameras , the answer isn't a particular resolution, but a specific aspect ratio, which must be 4:3.

What this means is that for every 4 horizontal pixels, you must grab 3 vertical pixels. To grab the image of Rosie, the capture resolution was 1120 pixels across and 840 pixels high. If you divide 1120 by 4, you get 280. Multiply 280 by 3 and you get 840.

It's a pain, but keep a calculator open on your desktop when you're grabbing still images. Once you find the optimal horizontal resolution for your images, divide by 4, multiply by 3, and you've calculated the ideal height. Or find an image editor like Ulead Systems' excellent PhotoImpact XL, which does the math for you ( Figure 5.17 ). The little Lock icon in the top tool panel constrains the crop tool to the selected shape, Digital Camera (4:3).

The other obvious question is, why can't you capture at an aspect ratio of 4:2.66, which is the aspect ratio for 720 x 480 pixels—the ultimate resolution at which you'll be displaying the video? The complete answer is long, confusing, and involves arcane differences between how computers and televisions display video data.

The quick, empirical answer is this: If you capture at the 4:2.66 aspect ratio and enter the result, Studio tells you via black bars at the top and bottom of the screen that you're not totally filling the screen ( Figure 5.18 ). These bars aren't present when the 4:3 aspect ratio is used, so 4:3 must be the optimal setting (Figure 5.16).

Tip

• Note that Studio's relatively new (since Studio 9 Plus) pan and zoom features allow you to zoom into the image and eliminate the black edges, so you don't have to perform this work in your image editor. See Inserting Pan and Zoom Effects later in the chapter.